第一篇:3级B-4级口语真题库(本站推荐)
【3级B、3级口语考试真题题库】 1.What’s your English name? 2.How old are you? 3.What’s your father?
4.What does your father do? 5.What is your father's job? 6.Is this a kite? / Is that a bird? 7.Are there any trees in front of your house? 8.What's this?/What's that? 9.What are these/What are those? 10.What's the weather like today?/How's the weather today? 11.What's the date today? 12.What day is(it)today? 13.Do you like singing? Why? 14.What is your favorite subject? Why? 15.What is your hobby? 【3级、4级口语考试真题题库】 1.When /Where were you born? 2.Where do you live? 3.What was the date yesterday? 4.Which do you like better, playing basketball or playing football? 5.Which season do you like best? Why? 6.How much is your shirt? 7.How often do you go shopping? 8.What do you want to be in the future? 9.How do you like swimming? Why? 10.How did you get here? 11.What do you usually do in your free/spare time? 12.What is your favorite food/animal/sport/subject? And why? 13.How far is it from your school to your home? 14.How many subjects do you have at school? What are they? 15.How long have you learned English? Do you like English? 【3级B、3级口语考试真题攻略】 1.My English name is Tom.没有或者名字难说就随便编一个,考试时别去想起什么名字好,叫什么名字酷…… 2.I’m ten.有的同学听不清问题,答成I ‘m fine, thank you.还加上一句And you?这就闹笑话了。3.My father is a cook.这个句型是问职业的,cook表示厨师,cooker是厨具,别说My father is a cooker.4.同上 5.同上。
3,4,5三个句型并称职业三件套,需要全部掌握,而且要会说,听力和单选也经常考。6.Yes it is./ No, it isn’t.this 和that 的问句一定要用it 来回答。7.Yes, there are./No, there aren’t.注意there be 提问一定用 there be 回答,be动词的单复数与问句保持统一。8.It’s a cup./ It’s a ruler.this 和that 的问句一定要用it 来回答。9.They are pens./ They are chairs.these 和those 的问句一定要用they 来回答。10.It’s sunny/rainy/windy/cloudy/foggy/snowy.11.It’s November the fifteenth.注意考前想好日期,同时注意与第12题的区别。12.It is Wednesday.注意考前想好星期几,同时注意与11题的区别。
13.Yes, I do.Because it’s very interesting./ No, I don’t.Because it’s very boring.如果不会说boring,又确实不喜欢,就说It’s not interesting.14.My favorite subject is English.Because it is very interesting.interesting这个词太好了。用来回答Why,几乎万能。15.My hobby is singing/dancing/swimming.【3级、4级口语考试真题攻略】
1.I was born on Spetember 15th, 1991(读做September the fifteenth, nineteen ninety-one.)/ I was born in Tianjin.考前想好出生年月日。2.I live in Tianjin.不需要答详细地址,别用live at给自己找麻烦。3.It was November the fourteen yesterday.这是个坑爹题。注意用was答。4.I like playing basketball better.5.I like spring best.Because it is warm in spring.6.It’s twenty yuan.7.I go shopping twice a week/ I go shopping every Sunday.8.I want to be an engineer in the future.选自己会的职业说。如果说工程师,注意用an 9.I like swimming very much.Because it is cool in the water.10.I got here by bike.坑爹题,注意时态。How是提问交通方式的,用交通方式答。11.I usually watch TV in my free time.12.My favorite food is hamburger, because it is delicious.食物不能用interesting了,要学会变化。其他几个也需要会说。13.It’s about one hundred meters.考试只要问距离就回答100米吧,别想别的怎么说了。
14.I have four subjects at school.They are Chinese, English, maths and art.不必按照实际情况作答,有的同学答了八九个科目,还想思想品德课英语怎么说,其实不用说那么多,口语主要考察你的英语能力,说四五个就行了。15.I have learned English for 4 years.Yes, I like it very much.坑爹题,考完成时的。如果不理解,就直接答 For 4 years.后边这句可以是Yes, I do,但不能答成Yes,I like.like后边一定要有宾语it.2
第二篇:B级应用文
B级应用文范文
1.告诉对方你将参加PETS四级考试。2.请对方帮忙购买口语教材。3.邀请对方来访。Dear Li Hua: It’s long time we haven’t seen each other.I miss you very much.How’s everything going on with you? I am busy preparing for PETS 4.I would appreciate if you could help me buy PETS 4 English oral textbook which was issued by the Beijing Press, because the books were sold out here.Drop in when you are free.I often think of those happy days we spent together when we were at University.Please let me know as soon as possible once you get the book.My best wishes.Yours truly,Wang Lei
2)选择一个你想旅游的地点,并安排旅行计划。你应包括下列内容: 1.说明你想旅游的地点;
2.说明你为什么选择这个地点; 3.描述你的旅行计划。Dear Amy, I plan to make a journey to Jiuzhaigou in Si Chuan province.It’s a beautiful place with fresh air, beautiful natural scenery like waterfall, lake and high mountains.Because many films and TV series have been made here, it is very famous.What’s more, I am very busy and exhausted this year, so I want to go for a relaxation.I plan to stay there for a week and travel with a tour group.I believe I will enjoy myself there.Best regards!
Yours ever
Tim
3)你的朋友邀请你参加他/她的生日聚会,告诉对方你不能接受他/她的邀请。你应包括下列内容:
1.告诉对方你不能接受他/她的邀请; 2.对对方的邀请表示感谢;
3.说明无法接受邀请的原因。Dear Lisa: Congratulations on your coming birthday.Thanks for your invitation, but I am sorry that I am afraid I am not able to attend your birthday party.You know, our company will hold an important meeting in our Paris branch to talk about the recent trouble appearing in business.I am the one who needs to make a presentation.I am terribly sorry for that.Anyway, I hope everything goes well in your birthday party.Remember to show me the pictures taken in the party when I come back from business trip.Best regards!
Yours ever
Susan
4)写一封信给Robert,信众包括如下内容:
1、了解对方近来的情况。
2、通知对方同学将在元旦举行聚会。
3、请对方参加。Dear Robert: I haven’t got your email for a long time.Are you still working for that IT company? How about your work? I’m writing to you to tell you that the English Department of Shanghai University takes pleasure in inviting the graduates to its New Year’s Evening Party, which will be held at the Assembly Hall on Saturday evening, December 31st, 2005.The party begins at 7 p.m.I think it’s a good chance for us to get together, would you please email me whether you will go to the party? Looking forward to hearing from you.Best wishes
Jean
5)写一封信给你的同学们,并邀请其参加同学聚会:
1、了解对方(毕业后)近来的情况。
2、通知对方同学将在五一(元旦)举行聚会。
3、请对方参加。
A Get-together on May 1st
April 15, 2007 Dear Wang Hong: How is everything getting along with you? It is almost one year since we graduated from university.I miss you very much.What have you been doing all these days? I have been a middle school teacher in my hometown since graduation.Teaching always keeps me busy, but I like my students and I love teaching, you know.So everything is fine here.There will be a former classmates’ getting together during this May Day holiday at my school.You are my best friend.I never forget those happy days we spent together.I hope you can come to my school when the time is due and you are free.I am looking forward to your reply.Yours truly,Li Hua
5)写一封email给你的朋友Robert,包含以下内容: 1.告诉对方你将参加英语四级考试。2.询问对方如何做准备。3.请对方建议一些参考书。Dear Robert: I’d like to tell you that your tips for study are really very helpful to me and I have made rapid progress in my English study.So I’m going to take CET-4 next term.I know that you passed it last year.Would you tell me how I can get prepared for it and what should I pay attention to? I don’t want to fail it.I think you must have much experience in it, so could you recommend me some books for practice? Looking forward to hearing from you.Best wishes
Jean
6).说明:请以总经理秘书(general secretary)的名义通知客户,公司因为开发新业务将迁至新地址,并为因此带来的不便表示歉意。同时借此机会感谢客户多年来的支持,表达期望长期合作的愿望。
具体信息如下:
迁址时间:2011年6月19日
公司新址:中山路17号中信大厦2022室
公司新电话,传真:025-83321145;025-83326542
Announcement of Removal Dear Sir or Madam, Due to the development of new business, our company will move to Room 2022 Zhongxin Building No.17 Zhongshan Road from June 19, 2011.Our new telephone and fax numbers are 025-83321145 and 025-83326542 respectively.We are very sorry for the inconvenience brought to you.We would also like to take this chance to thank you for your continued support over the years and hope that we can keep on working together in the future.Yours faithfully, Clare Tao General Secretary
7)南京大学外语系主任Clara Turner给院长写了一封备忘录,内容如下:我系急需两台电脑,以加强校际之间的联系,我们希望您能考虑下列事宜,并尽快予以解决:
1.请与有关部门确定购买电脑的时间。2.安排安装场所。3.安排管理人员。
Memo To: President of Nanjing University From: Clara Turner, Dean of the Foreign Language Department Date: June 20, 2011 Subject:Our department is badly in need of two computers to promote the inter-university contacts.I hope that you will think of the following and solve them as soon as possible.1.Please decide the purchasing time with the department concerned.2.Please fix up the installation place.3.Please arrange for managing personnel.8)假如你叫李丽,刚毕业于东北师范大学中文系,24岁。你从6月20日《中国日报》获悉一公司需要秘书,你想谋此职位。你精于速记,打字(80词/分)。
June 20, 2011 Dear Sir, Please allow me to apply for the position of secretary, which you advertised in China Daily on July 5.I graduated from Northeast Normal University after four-year study and my major is Chinese.I am just over twenty-four years of age.I have been striving to make myself proficient in shorthand and typewriting, and have attained a speed of eighty words per minute in typing.I believe that I can meet the needs of your company.I would appreciate an opportunity to meet with you.Thank you for your consideration and courtesy.Yours sincerely,Li Li
9)Your name is Wang Ying.You’re required to write a letter to a customer John Adams in Guangzhou to inform him that your General Manage Mr.Wang will pay him a visit next week.出访日期:2011年6月19日,星期一。
航班号:CA3597;起飞/到达时间:9:00/10:50。
访问意图:和John Adams 讨论明年的采购计划并询问对方时间是否合适。
Dear Mr.Adams, Thank you for long term support to our company.Please be informed that our General Manager Mr.Wang is planning to visit your office on Jun.19, 2011, Monday.His flight No.is CA3579 which takes off from Nanjing at 9:00 a.m.and arrives in Guangzhou at 10:50.He is expecting to discuss with you about your purchasing plan for next year.If the visiting time is inconvenient for you, please let me know as early as possible.With best regards,Sincerely yours,Wang Ying 10)1.事宜:关于计算机的用途以及如何利用Internet进行学习的讲座。2.讲座人:武汉大学计算机系申蓝教授。3.时间:6月26号,星期六,下午2:00。4.地点:图书馆208室。
5.参加对象:计算机爱好者。6.组织者:学生会。7.通知时间:6月19日
Notice To help students learn more about computers, we have invited Professor Shen Lan from the Computer Department of Wuhan University to give us a lecture on Saturday, June 26th.He will talk about the use of computer and how to learn through the Internet.The lecture begins at 2:00 p.m.in Room 208 of the Library Building.Any computer lover is welcome to attend the lecture.Please on time.The Students’ Union
19th,June
11)道歉信
说明:假如你是Sharon,因为要准备一个重要的考试,无法于本周三前往Lily家参加她的生日派对。请给Lily写一封致歉信,解释不能去的原因,向她表达诚挚的歉意并祝她生日快乐。
Dear Mary, There is an urgent business trip to Shenzhen that I have to go on June 19.Please reserve an air ticket for me that day.The arriving time would preferably be in the morning or at least before 4 p.m.on that day.Thank you!
12)备忘录 说明:假如你是公司销售部的秘书Jennifer,正在为新来的部门经理Harry准备一场欢迎仪式。欢迎仪式将于2011年6月19日晚上7点,在格林宾馆举行。请写一则备忘录通知部门全体同事。通知时间为2011年6月19日。
MEMO Date : June 19, 2011 To : Staff of Sales Department From : Jennifer, secretary of Sales Department Subject : Welcome party for new manager Harry Harry is appointed as our new Manager of Sales Department.We would like to hold a welcome party for him.All staff of Sales Department are suggested to attend.The party will be held in Green hotel at 7 p.m.tomorrow night.Please make sure you will come on time.12)传真
说明:你是公司总经理助理Andy,现在要发一份传真给Hilton,问他下周一的工业展览会准备工作如何,因为会议很重要,所以希望尽快了解最新的情况。你的传真号是68886342,Hilton的传真号是68886438。日期是2011年6月19日。
Words for reference: 总经理助理:assistant general manager 工业展览会:Industrial Exhibition
To : Hilton Fax No.: 68886438 Page :1 From : Andy Date : June 19, 2011 Ref No.: 68886342 Subject : The preparation of Industrial Exhibition Note: If the fax transmission fails, please inform us immediately.Dear Hilton, I am writing to inquire about the progress of the preparation work for the Industrial Exhibition on next Monday.This exhibition is known of great importance, so a rapid update of information is really necessary.Looking forward to your early reply.Best regards,Andy
Assistant General Manager
13)求职信 说明:请以郭芳的名义拟出一份给星星旅行社的求职信,希望能在该公司谋得导游一职。请注意书信的格式。写信日期为2011年6月20日。内容:
1、郭芳,24岁,毕业于南京旅游职业学院,主修旅游管理专业
2、精通英语和历史
3、有两年的工作经验
4、随信附上个人履历,期待回复 Words for reference: 旅行社:Travel Agency 旅游管理:tourist management 履历:resume 云南工商学院:Yunnan College of Business
June 20th,2011 Dear Sir or Madam: I have read the announcement about the vacancies of guides in Star Travel Agency, and I would like to submit my application.I am 24 years old and have graduated from Yunnan College of Business and Hospitality, majoring in tourist management.I’m proficient in English and history.With two years of experience in the field, I believe that I would be an excellent candidate for the position.I enclose my resume and look forward to hearing from you.Yours truly, Guo Fang
第三篇:B级作文
英语B级作文参考请以学生会的名义写一份通知,包括以下内容:
(1)11月28日晚上7点学生活动中心将会有一个讲座
(2)讲座邀请到著名的王教授来给广大同学做关于面试方面的内容
(3)欢迎广大同学前来参加,免费入场
(4)发通知时间11月20日
Notice
There will be a lecture at 7 p.m.on November 28, in Students’
Center.Famous Professor Wang is going to give us a speech on job
interview.The lecture is free and all the students are welcome.Students’ Union
Nov.20, 2006王小明毕业于湖北大学,专业是国际贸易,学习能力强,英语听说流利,请以他的名义
给ABC这家出口贸易公司的陈经理写一封求职信,请他考虑她的面试请求。写信时间是
2006年10月12日。
October 12, 2006
Dear Mr.Chen,I’m writing this letter to apply for a position in your company.I’m Wang Xiaoming and graduated from HubeiUniversity.My
major(专业)is International Trade.I’m good at study and have a
good command of English listening and speaking.I’ll appreciate(感
激)if you can consider giving me a chance of interview.(Hope to
hear from you soon).Yours faithfully
Wang Xiaoming请以学生会的名义给外语系的黄教授写一封邀请函,邀请他出席9月1日下午3点学生
会在演讲大厅举行的英语演讲比赛。演讲的内容是关于暑期兼职的经验。写信时间:8月
25日。
August 25, 2006Dear Professor Huang,We’d like to invite you attend the English Speech Contest which
will be held in the Speech Hall at 3 p.m.Sept.1st.The topic of the
speech is about the experience of part-time job in summer vocation.We look forward to your presence.Yours sincerel
Students’ Union4 请以John的名义给房东Mr.Smith写一封投诉信,内容包括:
(1)他所租住的房子的门铃再次出现故障
(2)该门铃上星期已经坏过一次,请人修理后不到一周时间再次出现问题
(3)请房东再派人来修理或者更换,否则本月的房租将会推迟交纳。
(4)写信时间为2006年8月15日。
August 15, 2006Dear Mr.Smith,The doorbell of the house I rent goes wrong again.There was
something wrong with it last week but it didn’t work after the repair.Please send someone to repair it or change it for me or I won’t give
you rent of the house for this month on time.Hope to hear from you
soon.Yours sincerelyJohn请以Phoebe的名义给假日饭店的经理写一封信,包括以下内容;
(1)你上周末在该饭店进餐时不慎丢失了一个红色手提包,回家后才发现
(2)手提包里有一些零钱,两本书,个人身份证等东西
(3)请经理代为寻找,如有找到,请把包寄回到广州市东风路86号,联系电话81235644,写信时间为2006年6月9日。
June 9, 2006
Dear Manager of Holiday Hotel,I lost a red handbag when I had dinner in your hotel last weekend.But I didn’t know it until I came home.There are some change, two
books, my ID card and etc in it.Would you please try to find it for me?
If you can get it, please send it to No.86 Dongfeng Road, Guangzhou
or you can contact me at 81235644.Yours sincerely
Phoebe你应邀到一位好友家吃晚饭。事后给朋友写信表示谢意。你的信应包括下列内容:
(1)表达谢意;
(2)表达想回请的意愿;
(3)期待朋友的光临。
Dear Ann,Thank you so much for the wonderful dinner last night!I had a
really good time in your home.You are an amazing cook.I am already longing for another get-together.Will you be free
next Saturday evening? I wonder if you could come and have dinner
with us.I will also invite our friends Joe and Kate.I'm sure they will
be pleased to meet you.I am looking forward to your joining us next Saturday evening.All the best,enny请帮ABC公司写信告知他们的客户Mr.Brown关于广告收费的问题,该客户开拓市场的广告每周五次,每次时间1分钟,每次收费5万元人民币。希望双方以后有机会合作。写
信时间2006年3月9日。
March 9, 2006
Dear Mr.Brown,I’m writing to tell you about the charge of your company’s ad..The
marketing ad.we made for your company will be on TV five times a
week and lasts for one minute each time.And the charge for each
time is 50,000 RMB.I hope we have chance to cooperate in the future.Yours sincerely
ABC Company以Lily的名义给小王写一张电话留言条,转告他老师打电话来通知明天下午的足球比赛
取消,改在下周二同一时间举行。明天下午请到实验楼参加计算机操作考试。
Xiao Wang,Your teacher called to say that the football match tomorrow
afternoon was cancelled and it would be held at the same time next
Tuesday.You are required to take part in the computer operation
exam in the Experiment
Building tomorrow afternoon.Lily9 以Tom的名义给他的秘书Mary写一份备忘录,请她通知各部门经理明天下午3点到5
楼会议厅参加关于WTO协议内容的紧急会议。时间4月5日。
Memo
From: Tom
To Mary
Date: April 5
Subject: Meeting on WTO agreement
Please inform the manager of each department to take part in an
urgent meeting on WTO agreement at 3 tomorrow afternoon in the
Meeting Hall on the 5th floor.请以Susan的名义给你的同学David留言,告诉他爸爸今天刚从家里来到学校看他,现
在住在学校宾馆3504房,回来后请打3564125电话给他,如果没人接的话请直接到宾馆房
间等候。
David,Your father came to see you from home today.He is now living
in Room 3504 of the College Hotel.Please call him at 356412 when
you come back.Please wait for him in his room if no one answers the
call.Susan11 以Dick的名义给你部门陈经理写封道歉信;
(1)为早上没能按时参加部门的紧急会议道歉
(2)迟到的原因是由于路上发生交通事故造成交通堵塞
(3)保证以后不再发生同样的事情
(4)时间2006年3月12日
March 12, 2006
Dear Mr.Chen,I’m writing to apologize/say sorry for my not being on time for the
urgent department meeting this morning.I was late because the
traffic accident caused traffic jam I promise it won’t happen again.Please forgive me.Yours sincerely
Dick请帮王小姐写份失物招领启事
(1)2月3日下午在学校操场上捡一个黑色钱包及一件外套
(2)请失主尽快打84567897联系认领
(3)时间是2006年2月4日
Found
February 4, 2006
A black wallet and a coat were found on the school’s playground in the afternoon of February 3.The owner can call Miss Wang at 84657879 as soon as possible.下面是几种常考作文类型的基本句型,牢记这些基本句型,对写作大有好处。通知
1.The Student Union is going to hold a party on Saturday evening,August 15.2.The party will be held in th garden of the Main Building.3.We are to visit the museum after lunch.4.The meeting starts at 6 p.m.5. The American guests are aboutto leave at 5 in the afternoon.感谢信与道歉信
1.Thank you very much for your help.2.It was good of you to invite me to take part in the activity.3.Please accept my sincere appreciation.4.Please accept my since reapologies.5.I have to offer you an apology for not coming to your party.6.I regret that my carelessness has caused you too much inconvenience.便条
1.I shall feel obliged if you will favor me with a call at your earliestconvenience.2.Upon receiving this note, pleasecome to my office.3.Mr.Li stands in urgent need of your help.4.Your note with an admission ticket enclosed is much appreciated.5.Hoping that the matter will bedealt with as soon as possible.求职信
1.I learned from the newspaper that your company wanted to hire anexperienced electrician.2.I am writing to inquire opportunities for computer programmersin your company.3.At school, I won a scholarship and the first prize in speech contest.4.I work hard and I can get along well with others.I’m good at Englishand especially my spoken English isvery good.5.I would welcome the opportunity for a personal interview with you
at personal interview with you at yourconvenience.邀请函及复函
1.It would be an honor to me if
you would accept our invitation.2.Will you do us a favor by joiningour party?
3.We sincerely hope you can attend.4.Please let us know if you’re available.5.Thank you for your very kind invitation.I should love to come, andI am looking forward to it very much.6.I regret that I have another arrangement at this time and will notbe able to attend.7.I am sorry that I shall not be able to join you because I am badlysick.
第四篇:B级作文及答案
备忘录
说明:以销售部培训经理的名义,写一份2006年6月19日发布的备忘录。包括以下内容: 收信人:所有销售部员工
发信人:Jim Green(销售部经理)内容:为了提高销售部员工的水平,要求所有销售部门员工参加一期销售培训课程。课程主要包括外语知识、销售规划、外贸函电写作等。课程从2006年6月26日开始,为期一周。地点为公司培训中心。希望员工按时参加。
Words for reference:销售规划sales program 培训中心training center
Date: June 19, 2006 To: All staff in Sales Department From: Jim Green(sales manager)Subject: Course on sales training
In order to improve our competence, we decide that all staff in our department are required to take a course on sales training.The trainings mainly concerns with skills in foreign languages, sales program and business letter writing.The course will begin on June 26, 2006 at our training center, lasting for a week.It will be appreciated if everyone can attend it on time.【难点分析】
备忘录是一种正式的专业文件。它结构清晰、阅读方便、传递迅速,经常为公司或团体使用。大多数备忘录的特点是简明扼要,但它们同时也应具备优秀应用文的其他写作原则:面向你的读者,表达清楚且准确。备忘录通常用于提醒、督促收信人,或就某个问题提出自己的意见或看法。在业务上.它一般用来补充正式文件的不足。备忘录简洁短小.各部分题目虽然看上去有些唐突,但它们可以使读者对事情有个大致了解并快速做出反应。一般用于公司内部的备忘录的常用格式为: Date(日期):__________ To(收信人):__________ From(发信人):__________ Subject(事由):____________________ ____________________________________________________________(正文部分)就本文而言,除了要掌握备忘录的格式.在内容方面要注意涵盖说明中所有表达要点,一般包括who,what, when, where和why这5个要素。
便条
收信人:Lilv 发信人:Mary 发信日期:2006年4月18日 内容:Mary给Lily留便条告知她们的人事经理Mr.Steward将因公在上海逗留5天。要Lily帮忙订一张4月20日从北京到上海的机票送到Mr.Steward办公室。同时向假日酒店电话预订一间带洗澡间的单人房.日期从4月20到24日。
April 18, 2006 Lily: Our Personnel Manager Mr.Steward will be in Shanghai on business for five days.Please reserve a plane ticket from Beijing to Shanghai on April 20 for Mr.Steward and then send it to his office, and call to hook a single room in Holiday Hotel, with bath, from April 20 to April 24 inclusive.Thank you very much.【难点分析】
便条是一种简单的书信。虽然内容简单。但却有其独特的风格。主要目的是为了尽快把最新的信息、通知、要求或者活动的时间、地点转告给对方。常见的便条有收条、欠条、留言和请假条等。便条可以有题目,也可以省略题目。便条开篇需有称呼语,但称呼可以比较随便。日期部分可写在便条的右上角。日期的签署通常只需写星期几或星期几的上午、下午,也可只写上午或下午或具体时间。只写日期也可以。便条结尾须署上留条人的姓名,位置在正文的右下角。便条的形式和内容都很简洁,故可以用几句话概括,正文语言要尽量通俗口语化,简单扼要,直截了当,无需使用客套语言。便条虽简单,但务必突出中心,更要注明活动的时间及地点。便条内容和类型不尽相同,可以灵活变通。但各类便条必须包括以下几个基本要素:1.Date(便条日期);2.Salutation(称呼);3.Body(正文);4.Signature(署名)
邀请函
说明:请按照下述要求,写一封邀请函。发信人:Harold 收信人:Jimmy 内容:
1.邀请Jimmy来参加家里举办的一个小型舞会以庆祝20周年结婚纪念日; 2.只准备邀请几位老朋友,希望Jimmy能携妻子Emma参加; 3.时间定在下周六,6月10日晚上7点;
4.知道他们很忙,但希望他们能设法来参加,并热切盼望其到来。写信日期:2006年6月1日
Words for reference:结婚纪念wedding anniversary 盼望look forward to
Dear Jimmy, My wife and I are going to have a small dancing party to celebrate our 20th wedding anniversary at home.We are going to invite some old friends and hope you and Emma can come.The time is next Saturday, June 10 at 7:00.I know you have been very busy recently, but I do hope you can manage it.We are looking forward to your coming with great pleasure.Yours affectionately, Harold
大学入学申请表
说明:请按照下面的中文提示,以中国学生王小明(男)的身份填写下列XXX大学入学申请表格。具体信息如下:
出生日期:1975年8月20日 联系地址:广州市中山路710号 联系电话:020—61006571 个人情况说明:本人毕业院校和目前就职情况,所要申请的专业,个人学习兴趣以及希望对方提供的信息等。Application Form Family name: __________ First name: __________ Date of Birth: __________ Nationality: __________ Sex: __________ Telephone number: __________ Address: Please write about your educational background and work experience, the university and the major you want to apply and the information you want to know.(about 50 words)Application Form Family name: Wang
First name: Xiaoming Date of Birth: August 20, 1975 Nationality: Chinese Sex: Male Telephone number: 020-61006571 Address: 710 Zhongshan Road, Guangzhou City Please write about your educational background and work experience, the university and the major you want to apply and the information you want to know.(about 50 words)
I graduated from Beijing Normal University.And I am currently an English teacher at Guangzhou University.I request admission into the Department of English Language and Literature at your University.It is my long-time desire to pursue comparative study of Chinese and Western literature.And I shall appreciate it if I can get more information about the financial aid.【难点分析】
本文要求填写一份出国留学申请表格。前半部分比较简单,只要将题目中的信息一一对应地翻译出来即可。难点在于对教育背景、个人工作经历以及所需要进一步获取的信息的写作。对此,考生可以按照自己的真实情况来写,也可以虚构.但是注意必须包含文章所要求的要点。对于这一部分的写作,考生要尽量使用简单句和自己熟悉的表达方式,同时要有适当的句式变化。
会议议程安排
说明:请按照下列提示,以总经理秘书孙玉的身份填写一份会议议程安排。会议时间:2006年12月10日下午3点 会议地点:公司多功能会议厅
参与者:总经理王明销售部经理李飞生产部经理刘力采购部经理张华 会议记录:孙玉 会议议程:
1.宣读、确认并签署了上次会议记录 2.总经理听取了各部门工作汇报
3.总经理宣布了公司的假期时间:7月5日-7月16日 4.无进一步问题讨论,会议于下午4点结束
Words for reference:多功能multifunctional采购purchase听取汇报hear the report from.
Time:__________ Place:__________ of the company Participants: 1.____________________ 2.Li Fei, sales manager 3.Liu Li, production manager 4.____________________ 5.Sun Yu, minutes keeper Agenda: 1.____________________ 2.____________________ 3.____________________ 4.____________________
参考范文
Minutes Time: 3:00 p.m.on December 10, 2006 Place: multifunctional meeting room of the company Participants: 1.Wang Ming, general manager 2.Li Fei, sales manager 3.Liu Li, production manager 4.Zhang Hua, purchase manager 5.Sun Yu, minutes keeper Agenda: 1.The minutes of the last meeting were read, confirmed and signed.2.The general manager heard the working report from the department managers.3.The general manager announced the dates of the company's holidays:5th to 16th July.4.No further business.The meeting ended at 4:00 p.m.【难点分析】
本文要求填制一份会议记录。会议记录一般包括会议时间、地点、出席人、缺席人、会议议程等等。就本题目而言,中文表达均已给出,考生只要将其合理地表达成英文即可。注意时间和地点的表达方式,另外还有个别单词或词组的翻译.如“听取汇报”为hear the report from…。
超市问卷调查表
说明:假定你是一名大学生,叫李玉(女),月收入在500元以下。于2006年7月5日去超市购物,临走时填了一份问卷调查表。内容如下:
1.每月大概光临该超市3次 2.对超市的总体管理感到满意
3.认为超市工作人员的服务态度很好 4.建议:
A.超市的购物环境有待改善,因为播放的音乐过于吵闹。B.建议增加收银机,节约顾客等待时间。C.鉴于学生支出有限.建议超市能对学生给予更大折扣。Words for reference:收银机the cash register支出expenditure Questionnaire To improve the quality of our service, we would be grateful if you'd complete the following questionnaire.Name:__________Sex:__________ Profession:__________Month salary:__________ Date of filling in:__________ How often would you come to our supermarket for shopping? Are you satisfied with our overall administration? What do you think of our supermarket service? Have you any other comments to help us to improve our service?
参考范文 Questionnaire To improve the quality of our service, we would be grateful if you'd complete the following questionnaire.Name: Li Yu Sex: female Profession: college student Month salary: less than 500RMB Date of filling in: July 5, 2006 How often would you come to our supermarket for shopping? 3 times per month.Are you satisfied with our overall administration? Yes.What do you think of our supermarket service? Good.Have you any other comments to help us to improve our service? 1.I think the shopping environment need to be improved because the music here is too noisy.2.It is advisable to increase the number of the cash registers in order to save the consumers’ time.3.I hope more discount can be given to students for they have limited expenditure.【难点分析】
本文是一份问卷调查表。前半部分需要将题目中提供的信息一一对应填入表格。难点在建议部分,得分的要点是要对题目中的建议表达清楚、准确,符合英文的表达习惯,另外注意表达建议时语气的恰当性,要诚恳但不夸张。
第五篇:2015钳工试题(B级)
2012年轧钢厂钳工技能鉴定试题(B级)
一、单向选择题(60题)
1.一张完整的装配图的内容包括:⑴一组图形;⑵(D);⑶必要的技术要求;⑷零件序号和明细栏;⑸标题栏。
A、正确的尺寸 B、完整的尺寸 C、合理的尺寸 D、必要的尺寸 2.零件图中注写极限偏差时,上下偏差小数点(A)小数点后位数相同,零偏差必须标注。A、必须对齐 B、不需对齐 C、对齐不对齐两可 D、依个人习惯 3.局部剖视图用(D)作为剖与未剖部分的分界线。
A、粗实线 B、细实线 C、细点划线 D、波浪线 4.画出各个视图是绘制零件图的(C)。
A、第一步 B、第二步 C、第三步 D、第四步 5.内径百分表的测量范围是通过更换(D)来改变的。
A、表盘 B、测量杆 C、长指针 D、可换触头 6.孔的最小极限尺寸与轴的最大极限尺寸之代数差为正值叫(B)。
A、间隙值 B、最小间隙 C、最大间隙 D、最大过盈 7.表面粗糙度通常是按照波距来划分,波距小于(D)mm属于表面粗糙度。A、0.01 B、0.1 C、0.5 D、1 8.带传动具有(A)特点。
A、吸振和缓冲 B、传动比准确 C、适用两传动轴中心距离较小 D、效率高 9.(A)是造成工作台往复运动速度误差大的原因之一。
A、油缸两端的泄漏不等 B、系统中混入空气 C、活塞有效作用面积不一样 D、液压缸容积不一样 10.形状复杂,精度较高的刀具应选用的材料是(B)。
A、工具钢 B、高速钢 C、硬质合金 D、碳素钢 11.在钻床钻孔时,钻头的旋转是(C)运动。
A、进给 B、切削 C、主 D、工作
12.外圆柱工件在套筒孔中的定位,当工件定位基准和定位孔较长时,可限制(C)自由度。A、两个移动 B、两个转动
C、两个移动和两个转动 D、一个移动一个转动 13.电磁抱闸是电动机的(A)方式。
A、机械制动 B、电力制动 C、反接制动 D、能耗制动 14.球化退火一般适用于(D)。
A、优质碳素结构钢 B、合金结构钢
C、普碳钢 D、轴承钢及合金工具钢 15.将钢件加热、保温,然后在空气中冷却的热处理工艺叫(C)。
A、回火 B、退火 C、正火 D、淬火 16.(A)完全依赖于零件制造精度的装配方法是完全互换法。
A、装配精度 B、加工精度 C、加工误差 D、减少误差 17.分度头的手柄转一周,装夹在主轴上的工件转(D)。
A、1周 B、20周 C、40周 D、1/40周 18.锯条上的全部锯齿按一定的规律(C)错开,排列成一定的形状称为锯路。
A、前后 B、上下 C、左右 D、一前一后 19.用半孔钻钻半圆孔时宜用(A)。
A、低速手进给 B、高速手进给 C、低速自动进给 D、高速自动进给 20.攻丝进入自然旋进阶段时,两手旋转用力要均匀并要经常倒转(B)圈。
A、1~2 B、1/4~1/2 C、1/5~1/8 D、1/8~1/10 21.圆板牙的前角数值沿切削刃变化,(B)处前角最大。
A、中径 B、小径 C、大径 D、大径和中径 22.检查曲面刮削质量,其校准工具一般是与被检曲面配合的(B)。
A、孔 B、轴 C、孔或轴 D、都不是 23.研具材料与被研磨的工件相比要(A)。
A、软 B、硬 C、软硬均可 D、相同
24.在研磨过程中起切削作用、研磨工作效率、精度和表面粗糙度,都与(A)有密切关系。A、磨料 B、研磨液 C、研具 D、工件 25.相同材料,弯曲半径越小,变形(A)。
A、越大 B、越小
C、不变 D、可能大也可能小
26.在计算圆孤部分中性层长度的公式A=π(r+x0t)α/180中,x0指的是材料的(C)。A、内弯曲半径 B、中间层系数 C、中性层位置系数 D、弯曲直径
27.若弹簧的外径与其它另件相配时,公式D0=(0.75-0.8)D1中的系数应取(D)值。A、大 B、偏大 C、中 D、小 28.由一个或一组工人在不更换设备或地点的情况下完成的装配工作叫(A)。A、装配工序 B、工步 C、部件装配 D、总装配 29.产品的装配工作包括部件装配和(A)。
A、总装配 B、固定式装配 C、移动式装配 D、装配顺序 30.为消除零件因偏重而引起振动,必须进行(A)。
A、平衡试验 B、水压试验 C、气压试验 D、密封试验 31.分组选配法的装配精度决定于(B)。
A、零件精度 B、分组数 C、补偿环精度 D、调整环的精度 32.立式钻床的主要部件包括(B)、进给变速箱、主轴和进给手柄。
A、操纵机构 B、主轴变速箱 C、齿条 D、铜球接合子 33.立钻Z525主轴最高转速为(B)。
A、97r/min B、1360r/min C、1420r/min D、480r/min 34.在拧紧(D)布置的成组螺母时,必须对称地进行。
A、长方形 B、圆形 C、方形 D、圆形或方形 35.装配紧键时,用涂色法检查键下、下表面与(C)接触情况。
A、轴 B、毂槽 C、轴和毂槽 D、槽底
36.带轮相互位置不准确会引起带张紧不均匀而过快磨损,当〔C〕不大时,可用长直尺准确测量。A、张紧力 B、摩擦力 C、中心距 D、都不是 37.带传动机构使用一般时间后,三角带陷入槽底,这是(C)损坏形式造成的。
A、轴变曲 B、带拉长 C、带轮槽磨损 D、轮轴配合松动 38.链传动的损坏形式有链被拉长,(B)及链断裂等。
A、销轴和滚子磨损 B、链和链轮磨损 C、链和链轮配合松动 D、脱链
39.影响齿轮传动精度的因素包括齿轮的加工精度,齿轮的精度等级,齿轮副的侧隙要求,及(D)。A、齿形精度 B、安装是否正确
C、传动平稳性 D、齿轮副的接触斑点要求 40.蜗轮副正确的接触斑点位置应在(C)位置。
A、蜗杆中间 B、蜗轮中间
C、蜗轮中部稍偏蜗杆旋出方向 D、蜗轮中部稍偏蜗轮旋出方向 41.离合器装配的主要技术要求之一是能够传递足够的(C)。
A、力矩 B、弯矩 C、扭矩 D、力偶力 42.离合器是一种使(B)轴接合或分开的传动装置。
A、主 B、主、从动 C、从动 D、连接 43.向心滑动轴承按结构不同可分为整体式、剖分式和(D)。
A、部分式 B、不可拆式 C、叠加式 D、内柱外锥式 44.滑动轴承装配的主要要求之一是(B)。
A、减少装配难度 B、获得所需要的间隙 C、抗蚀性好 D、获得一定速比 45.滚动轴承型号有(C)数字。
A、5位 B、6位 C、7位 D、8位 46.柴油机的主要(A)是曲轴。
A、运动件 B、工作件 C、零件 D、组成
47.能按照柴油机的工作次序,定时打开排气门,使新鲜空气进入气缸和废气从气缸排出的机构叫(A)。
A、配气机构 B、凸轮机构 C、曲柄连杆机构 D、滑块机构 48.对于形状简单的静止配合件拆卸时,可用(A)。
A、拉拔法 B、顶压法 C、温差法 D、破坏法 49.被腐蚀的金属表面当受到机械磨损作用时,将(A)磨损。
A、加剧 B、减少 C、停止 D、产生 50.消除铸铁导轨的内应力所造成的变化,需在加工前(C)处理。
A、回火 B、淬火 C、时效 D、表面热 51.丝杠螺母传动机构只有一个螺母时,使螺母和丝杠始终保持(B)。A、双向接触 B、单向接触 C、单向或双向接触 D、三向接触 52.(C)装卸钻头时,按操作规程必须用钥匙。
A、电磨头 B、电剪刀 C、手电钻 D、钻床 53.电线穿过门窗及其它可燃材料应加套(B)。
A、塑料管 B、磁管 C、油毡 D、纸筒 54.起吊时吊钩要垂直于重心,绳与地面垂直时,一般不超过(D)。
A、75° B、65° C、55° D、45° 55.使用(A)时应戴橡皮手套。
A、电钻 B、钻床 C、电剪刀 D、镗床 56.(C)的作用是保护电路。
A、接触器 B、变压器 C、熔断器 D、电容器 57.对零件进行形体分析,确定主视图方向是绘制零件图的(A)。
A、第一步 B、第二步 C、第三步 D、第四步 58.内径百分表装有游丝,游丝的作用是(D)。
A、控制测量力 B、带动长指针转动 C、带动短指针转动 D、消除齿轮间隙 59.下列(D)为形状公差项目符号。
A、⊥ B、∥ C、◎ D、○
60.机械传动是采用带轮、齿轮、轴等机械零件组成的传动装置来进行能量的(B)。A、转换 B、传递 C、输送 D、交换
二、多项选择题(30题)
1.带传动不能做到的是(C)。
A、吸振和缓冲 B、安全保护作用
C、保证准确的传动比 D、实现两轴中心较大的传动 2.液压传动的工作介质是具有一定压力的(B)。
A、气体 B、液体 C、机械能 D、电能 3.液压系统中的控制部分是指(C)。
A、液压泵 B、液压缸
C、各种控制阀 D、输油管、油箱等 4.液压系统不可避免的存在(A)故其传动比不能保持严格准确。
A、泄漏现象 B、摩擦阻力 C、流量损失 D、压力损失 5.规定(C)的磨损量VB作为刀具的磨损限度。
A、主切削刃 B、前刀面 C、后刀面 D、切削表面 6.磨削加工的主运动是(A)。
A、砂轮圆周运动 B、工件旋转运动 C、工作台移动 D、砂轮架运动 7.工件以外圆柱面作为定位基准,当采用长V形块定位时,可限制(D)自由度。A、一个 B、两个 C、三个 D、四个 8.钻床夹具有:固定式、回转式、移动式、盖板式和(B)。
A、流动式 B、翻转式 C、摇臂式 D、立式 9.对照明电路,下面(B)情况不会引起触电事故。
A、人赤脚站在大地上,一手接触火线,但未接触零线 B、人赤脚站在大地上,一手接触零线,但未接触火线 C、人赤脚站在大地上,二手同时接触火线,但未碰到零线 D、人赤脚站在大地上,一手同时接触火线,另一手接触零线 10.装配精度完全依赖于零件(B)的装配方法是完全互换的。
A、加工精度 B、制造精度 C、加工误差 D、精度 11.锯路有交叉形,还有(A)。
A、波浪形 B、八字形 C、鱼鳞形 D、螺旋形 12.使用普通高速钢铰刀在钢件上铰孔,其机铰切削速度不应超过(A)。
A、8m/min B、10m/min C、15m/min D、20m/min 13.标准丝锥切削部分的前角为(C)。
A、5°~6° B、6°~7° C、8°~10° D、12°~16° 14.确定底孔直径的大小,要根据工件的(D)、螺纹直径的大小来考虑。
A、大小 B、螺纹深度 C、重量 D、材料性质 15.精刮时要采用(B)。
A、短刮法 B、点刮法 C、长刮法 D、混合法 16.在研磨过程中起润滑冷却作用的是(C)。
A、磨料 B、研具 C、研磨液 D、研磨剂 17.矫直棒料时,为消除因弹性变形所产生的回翘可(C)一些。A、适当少压 B、用力小
C、用力大 D、使其反向弯曲塑性变形 18.如果薄板表面有相邻几处凸起,应先在(D)处轻轻锤击。
A、一个凸起 B、最大凸起 C、边缘凸起 D、凸起交界 19.板料在宽度方向上的弯曲,可利用金属材料的(C)。
A、塑性 B、弹性 C、延伸性能 D、导热性能 20.零件的清理、清洗是(A)的工作要点。
A、装配工作 B、装配工艺过程 C、装配前准备工作 D、部件装配工作 21.产品的装配工作包括总装配和(D)。
A、固定式装配 B、移动式装配 C、装配顺序 D、部件装配 22.装配前准备工作主要包括零件的清理和清洗、(A)和旋转件的平衡试验。A、零件的密封性试验 B、气压法 C、液压法 D、静平衡试验 23.装配精度检验包括(D)检验和几何精度检验。
A、密封性 B、功率 C、灵活性 D、工作精度
24.要在一圆盘面上划出六边形,问每划一条线后分度头的手柄应摇(B)周,再划第二条线。A、2/3 B、6·2/3 C、6/40 D、1 25.立钻(C)二级保养,要按需要拆洗电机,更换1号钙基润滑脂。
A、主轴 B、进给箱 C、电动机 D、主轴和进给箱 26.用测力扳手使预紧力达到给定值的方法是(A)。
A、控制扭矩法 B、控制螺栓伸长法 C、控制螺母扭角法 D、控制工件变形法 27.静连接花键装配,要有较少的(A)。
A、过盈量 B、间隙 C、间隙或过盈量 D、无要求 28.过盈连接的配合面多为(C),也有圆锥面或其他形式的。
A、圆形 B、正方形 C、圆柱面 D、矩形 29.采用三角带传动时,摩擦力是平带的(D)倍。
A、5 B、6 C、2 D、3 30.(B)传动中,其下垂度2%L为宜。
A、带 B、链 C、齿轮 D、螺旋
三、是非判断题(40题)(×)零件上常见孔的尺寸注法有两种,分别是旁注法和特殊注法。(×)零件图是指导制造、加工零件的技术文件,它表示零件的结构形状、大小、有关的工艺要求和技术要求。(√)装配图是指导机器和部件装配、检验、调试、安装和维修的技术文件,它表示机器和部件的工件原理、各零部件间的装配关系、相对位置、结构形状和有关技术要求等。(√)圆锥齿轮与圆柱齿轮的画法基本相同,直齿圆锥齿轮啮合时,在剖视图中,节线相交于一点。(×)在零件图上标注尺寸时,有时可以出现封闭的尺寸标注。6(√)国家标准规定:尺寸的标准公差等级共有20个,数值越小,精度越高,一般认为IT3—IT5(孔为IT6)的等级用于重要配合。(×)在选择零件间的配合时,有相对运动的,应选择间隙配合,反之就选过盈配合 8(×)零件的尺寸公差要求可用尺寸公差带代号或上、下偏差来表达,其它形式不可用 9(×)每个产品、部件、零件的图样和文件都应有独立的代号。(×)在装配图中,键是实现轴上零件周向定位的零件,为保证其装卸,键的各表面与其他零件的表面应有适当的间隙。(√)普通螺纹用于连接,梯形螺纹用于传动。(√)在装配图中,滚动轴承可根据外径、内径和宽度等几个主要尺寸,按简化或示意图的方法表示。(√)在画普通螺栓连接时,在剖视图中螺栓与安装孔间应留有间隙。14(×)铸造铝合金和形变铝合金都可用压力加工方法加工成零件。15(×)轴承合金是制造轴承滚珠的材料。(×)表面淬火的零件常用低碳结构钢制造,经表面淬火后获得高硬度。17(×)铰削铸铁件时,加煤油可造成孔径缩小。(√)封闭环的确定方法是要根据加工和装配方法以及测量方法而定。19(√)装配尺寸链中,封闭环属于装配精度。20(×)工艺尺寸链中,必须要有减环。21(√)封闭环公差等于各组成环公差之和。(√)在完全定位中,通常要选几个表面为定位基准,不论其定位基准面大小,限制自由度最多的那个基面即为主要定位基面。(√)在加工箱体、支架类零件时,常用工件的一面两孔定位,以使基准统一。这种定位方式所采用的定位元件为支承板、一个短圆柱销和一个菱形销。(×)精密夹具装配调整中,不能选用装配尺寸链的公共环作为补偿环。(√)在精密夹具装配的过程中,将便于拆装的零件作为补偿环,有利于简化装配工艺。26(√)为了保证由支承钉组成定位平面的精度,常常将支承钉装入夹具体后,再对定位平面进行加工。(×)工件在V形块上定位,尽管V形块的对中性好,但由于一批工件的直径是变化的,所以定位基准在水平方向仍存在位置误差。(√)采用机床自身加工夹具零件,是制造精密夹具的方法之一。(×)夹具的对定销装配后,只要对定销能插入和拨出分度板的分度孔,就能保证定位精度。30(×)成形车刀的截形设计就是指根据零件的廓形来确定刀具的廓形。
31(√)铰刀的切削厚度较小,磨损主要发生在后刀面上,所以重磨沿后刀面进行。
32(√)由于铰孔的扩张量和收缩量较难准确地确定,铰刀直径可预留0.01mm的余量,通过试铰以后研磨确定。
33(×)由于铰刀用于孔的精加工,所以圆柱机用铰刀设计时,其直径和公差只依据工件孔的加工尺寸和精度确定。
34(×)正装式复合模结构简单,又可以直接利用压力机的打杆装置进行推件,卸件可靠,便于操作,并为机械化出件提供了有利条件,故应用十分广泛。
35(√)对于凹模装在下模座上的导柱模,模具的固定部分是装配时的基准部件,因此应先行装配。
36(√)通常弯曲模的凸模的圆角半径应等于制件的弯曲半径。37(×)导向零件是保证凸、凹模间隙的部件。
38(×)在装配过程中,每个零件都必须进行试装,通过试装时的修理、刮削、调整等工作,才能使产品达到规定的技术要求。
39(√)在制定装配工艺规程时,每个装配单元通常可作为一道装配工序,任何一产品一般都能分成若干个装配单元。
40(√)产品的装配顺序,基本上是由产品的结构和装配组织形式决定。
四、简答题:(5题)
1.什么是弹性变形?
答:金属零件,在外力作用下,都要引起变形,当外力卸除之后,变形便会消失,金属零件就恢复到原始状态,这种现象称为弹性变形。2.皮带拉力与包角有什么关系?
答:皮带的拉力大小与小皮带轮的包角a有很大的关系。包角越小,则拉力就越小;包角越大,则拉力就越大,一般包角不得小于150℃。
3.齿轮传动有什么缺点?
答:齿轮传动的缺点是:传动不平稳且有噪声,不能无级变速;对齿轮的制造和安装都有较高的工艺要求,当两轴间距离过远时,也不适宜采用齿轮传动。
4.齿轮传动有什么优点?
答:齿轮传动有以下优点:⑴效率高;⑵结构紧凑;⑶传动比固定不变;⑷工作可靠,寿命长。5.什么是基本尺寸、实际尺寸和极限尺寸?
答:设计给定的尺寸,叫做基本尺寸。通过刚度、强度计算或结构等方面的考虑,按标准直径或标准长度圆整后给定的尺寸,通过测量获得的尺寸叫实际尺寸。允许尺寸变化的两个界限值,叫做极限尺寸。
五、计算题(4题)
1.用刻度值为0.02mm/1000mm的水平仪测量长度为1.2m的平面,如果水平仪水准气泡向右移动2格,问面两端倾斜的高度差为多少?
3解:h=(1.2×10)×0.02×2=0.048mm 1000答:平面两端倾斜的高度差为0.048mm 2.用压铅法测量离心泵滑动轴承的顶间隙,测得轴颈上顶部各段铅丝压扁后的厚度分别是:B1=0.07mm,B2=0.08mm,B2=0.09mm,轴瓦两侧结合面上用于测量的紫铜垫厚度a=0.2mm。已知轴承的顶间隙要求为0.11~0.15,如轴瓦顶间隙课通过两侧接合面垫片进行调整,问垫片的厚度应为多少?
解:测得离心泵的滑动轴承的顶间隙
EB1B2B30.070.080.09a0.20.12mm
33垫片的厚度最大值=0.11-(-0.12)=0.23mm 垫片的厚度最小值=0.15-(-0.12)=0.27mm 即垫片厚度应为在0.23~0.27mm之间,故垫片的厚度取0.25mm 答:垫片的厚度应为0.25mm 3.当用百分表测量夹紧杆来测验齿轮啮合间隙时,已知:百分表测点的距离齿轮轴线L为180mm,齿轮齿数Z=60,模数m=3mm,百分表测量值C为0.3mm,求该圆柱啮合齿轮的侧隙多少?
jn为解:由公式:分度圆半径R=
1mz得 211Rmz36090mm
由公式jc得: 22LR90jC0.30.15mm
L180R答:圆柱啮合齿轮的侧隙为0.15mm.4.某螺栓联接,螺栓受轴向力F为13000N,已知螺纹大经D为ø10mm,小径d为ø9mm,螺栓材料的需用拉应力[δ]=200MPa,问螺栓使用时是否符合强度条件? 解:Ad243.149263.585mm2
4F13000204.45MPa A63.585因[δ]=200MPa,故δ>[δ],所以螺栓强度不够 答:螺栓强度不够.六、论述题(3题)
1.油泵不上油的原因一般有哪几类
答:油泵不上油一般有以下几点原因①原动机与泵间连接失效,泵不工作;②油泵转向不对;③有污物阻塞;④连接在管道上的阀有损坏,使管道堵塞;⑤泵的内部泄漏过大;⑥管道泄流过大.2.绘图时选择主视图的原则是什么?
答:主视图是最主要的视图,通常以能比较全面表现零件形状特征及各组合体相对位置的一面作主视图,在选择主视图时还应注意在俯视图、左视图中尽量少出现虚线。3.工业生产中广泛使用的是哪种电动机?这种电动机由哪些主要部件组成?
答:工业生产中广泛使用的是三相异步电动机。它主要由定子和转子两大部分组成。定子由定子铁芯、定子绕组和外壳三部分组成,是电机的固定部分。转子由转子铁芯、转子绕组、转轴和轴承组成,是电机的转动部分。