阅读理解 -交大网络教育-英语第四次在线作业

第一篇：阅读理解 -交大网络教育-英语第四次在线作业

阅读理解请从每个问题后的A.B.C.D四个选项中选出正确选项。

The French Revolution broke out in 1789.At the time Francewas in a crisis.Thegovernment was badly run and people’s lives were miserable.King Louis XIV tried to control the national parliament and raise more taxes.But his effort failed.He ordered his troops to Versailles.The people thought that Louis intended to put down the Revolution by force.On July 14,1789, they stormed and took the Bastille, where political prisoners were kept.Ever since that day, July 14 has been the French National Day.Louis tried to flee the country in 1792 to get support from Austriaand Prussia.However, he was caught and put in prison.In September 1792, themonarchy was abolished.In the same year, Louis was executed.A few months later his wife, Marie also had her head cut off.The Revolution of France had frightened the other kings ofEurope.Armies fromAustria andPrussia began to march againstFrance.The French raised republican armies to defend the nation.The Revolution went through a period of terror.Thousands of people lost their lives.In the end, power passed to Napoleon Bonaparte.题目1完成满分1.00What’s this passage about?

选择一项：a.King Louis.b.Europe.c.The French Revolution.d.France.题目2完成满分1.00What was NOT the effect of the Revolution?

选择一项:a.The king tried to control the national parliament.b.Louis’s wife, Marie was killed.c.It brought some impact on the other European kings.d.July 14 has become the French National Day.题目3完成满分1.00What does the underlined word “abolished ” mean?

选择一项：a.Put off.b.United.c.Established.d.Ended.题目4完成满分1.00Which did not happen in 1789?

选择一项：a.The national economy was developing rapidly.b.King Louis XIV was in power.c.The government wasn’t well run.d.The French Revolution broke out.题目5完成满分1.00Where were the political prisoners kept?

选择一项：a.In Austria C.b.In Bastille.c.In Versailles.d.In Prussia.阅读理解请从每个问题后的A.B.C.D四个选项中选出正确选项。

Britain and Franceare separated by theEnglish Channel, a body of water that can be crossed in as few as 20 minutes.But the cultures of the two countries sometimes seem to be miles apart.Last Thursday Britain and France celebrated the 100th anniversary(周年纪念)of the signing of a friendship agreement called the Entente Cordiality.The agreement marked a new beginning for the countries following centuries of wars and love-hate partnership.But their relationship has been ups and downs over the past century.Just last year, there were fierce disagreements over theIraqwar-which British Prime Minister Tony Blair supported despite French President Jacques Chirac speaking out against it.This discomfort is expressed in Blair and Chirac’s body language at international meetings.While the French leader often greets German Chancellor Gerhard Schroeder with a hug(拥抱)，Blair just receives a handshake.However, some political experts say the war inIraqcould in fact have helped ties.The history of divisions may well be because of the very different ways in which the two sides see the world.But this doesn’t stop 12 million Britons taking holidays inFranceeach year.However, only 3 million French come in the opposite direction.Surveys(调查)show that most French people reel closer to the Germans than they do to the British.And the research carried out inBritainhas round that only a third of the population believes the French can be trusted.Perhaps this bad feeling comes because the British dislikeFrance’s close relationship withGermany, or because the French are not happy withBritain’s close links with theUS.Whatever the answer is, as both sides celebrate 100 years of “doubtful friendship”, they are at least able to make jokes about each other.Here’s one: What’s the best thing about Britain’s relationship with France? The English Channel

题目6完成满分1.00For centuries, the relationship between and is __________.选择一项：a.friendlyb.brotherlyc.a mixture of love and hated.impolite

题目7完成满分1.00What does the last sentence mean?

选择一项：a.As long as the English Channel exists, no further disagreement will form between France and

Britain.b.The English Channel can prevent anything unfriendly happening in both France and Britain.c.The English Channel is the largest enemy between France and Britain.d.Franc and Britain are near neighbors, and this will help balance the relationship between

them.题目8完成满分1.00The war in does _________ to the relationship between and.选择一项：a.both good and harmb.neither good nor harmc.goodd.harm

题目9完成满分1.00The British are not so friendly to________ and the French are not so friendly to _________.选择一项：a.Germany;Germanyb.America;Germanyc.Germany;Americad.America;America

题目10完成满分1.00________ are more interested in having holidays in _________.选择一项：a.British people„ Germanyb.French people„ Britain

c.American people„ Britaind.British people„ France

阅读理解请从每个问题后的A.B.C.D四个选项中选出正确选项。

Community service is an important component of education here at our university.We encourage all students to volunteer for at least one community activity before they graduate.A new community program called “One On One ” helps elementarystudents who’ve fallen behind.Your education majors might be especially interested in it because it offers the opportunity to do some teaching, that is, tutoring in math and English.You’d have to volunteer two hours a week for one semester.You can choose to help a child with math, English, or both.Half-hour lessons are fine, so you could do a half hour of each subject two days a week.Professor Dodge will act as a mentor to the tutors-he’ll be available to help you with lesson plans or to offer suggestions for activities.He has office hours every Tuesday and Thursday afternoon.You can sign up for the program with him and begin the tutoring next week.I’m sure you’ll enjoy this community service… and you’ll gain valuable experience at the same time.It looks good on your resume, too, showing that you’ve had experience with children and that you care about your community.If you’d like to sign up, or if you have any questions, stop by Professor Dodge’s office this week.题目11完成满分1.00What should students who are interested in the tutorials do?

选择一项：a.Talk to professor Dodge.b.Submit a resume to the dean.c.Sign up for a special class.d.Contact the elementary school.题目12完成满分1.00Whom do you think the speaker addresses?

选择一项：a.Graduated students.b.Students.c.Residents.d.Faculty.题目13完成满分1.00What is the purpose of the program that the speaker describes?

选择一项：a.To help education majors prepare for final exams.b.To offer tutorials to elementary school students.c.To provide funding for a community service project.d.To find jobs for graduating students.题目14完成满分1.00What is the purpose of the talk?

选择一项：a.To explain a new requirement for graduation.b.To interest students in a new community program.c.To recruit elementary school teachers for a special program.d.To discuss the problems of elementary school students.题目15完成What does professor Dodge do?

选择一项：a.He teaches part-time in an elementary school.b.He advises students to participate in certain program.c.He helps students prepare their resumes.d.He observes elementary school students in the classroom.

第二篇：阅读理解 -交大网络教育-英语第四次在线作业

阅读理解

请从每个问题后的A.B.C.D四个选项中选出正确选项。

The French Revolution broke out in 1789.At the time Francewas in a crisis.The government was badly run and people’s lives were miserable.King Louis XIV tried to control the national parliament and raise more taxes.But his effort failed.He ordered his troops to Versailles.The people thought that Louis intended to put down the Revolution by force.On July 14,1789, they stormed and took the Bastille, where political prisoners were kept.Ever since that day, July 14 has been the French National Day.Louis tried to flee the country in 1792 to get support from Austriaand Prussia.However, he was caught and put in prison.In September 1792, the monarchy was abolished.In the same year, Louis was executed.A few months later his wife, Marie also had her head cut off.The Revolution of France had frightened the other kings ofEurope.Armies fromAustria andPrussia began to march againstFrance.The French raised republican armies to defend the nation.The Revolution went through a period of terror.Thousands of people lost their lives.In the end, power passed to Napoleon Bonaparte.题目1 完成满分1.00 What’s this passage about? 选择一项：

a.King Louis.b.Europe.c.The French Revolution.d.France.题目2 完成满分1.00 What was NOT the effect of the Revolution? 选择一项:

a.The king tried to control the national parliament.b.Louis’s wife, Marie was killed.c.It brought some impact on the other European kings.d.July 14 has become the French National Day.题目3 完成满分1.00 What does the underlined word “abolished ” mean? 选择一项：

a.Put off.b.United.c.Established.d.Ended.题目4 完成满分1.00 Which did not happen in 1789?

选择一项：

a.The national economy was developing rapidly.b.King Louis XIV was in power.c.The government wasn’t well run.d.The French Revolution broke out.题目5 完成 满分1.00

Where were the political prisoners kept?

选择一项：

a.In Austria C.b.In Bastille.c.In Versailles.d.In Prussia.阅读理解

请从每个问题后的A.B.C.D四个选项中选出正确选项。

Britain and Franceare separated by theEnglish Channel, a body of water that can be crossed in as few as 20 minutes.But the cultures of the two countries sometimes seem to be miles apart.Last Thursday Britain and France celebrated the 100th anniversary(周年纪念)of the signing of a friendship agreement called the Entente Cordiality.The agreement marked a new beginning for the countries following centuries of wars and love-hate partnership.But their relationship has been ups and downs over the past century.Just last year, there were fierce disagreements over theIraqwar-which British Prime Minister Tony Blair supported despite French President Jacques Chirac speaking out against it.This discomfort is expressed in Blair and Chirac’s body language at international meetings.While the French leader often greets German Chancellor Gerhard Schroeder with a hug(拥抱)，Blair just receives a handshake.However, some political experts say the war inIraqcould in fact have helped ties.The history of divisions may well be because of the very different ways in which the two sides see the world.But this doesn’t stop 12 million Britons taking holidays inFranceeach year.However, only 3 million French come in the opposite direction.Surveys(调查)show that most French people reel closer to the Germans than they do to the British.And the research carried out inBritainhas round that only a third of the population believes the French can be trusted.Perhaps this bad feeling comes because the British dislikeFrance’s close relationship withGermany, or because the French are not happy withBritain’s close links with theUS.Whatever the answer is, as both sides celebrate 100 years of “doubtful friendship”, they are at least able to make jokes about each other.Here’s one: What’s the best thing about Britain’s relationship with France? The English Channel

题目6 完成满分1.00

For centuries, the relationship between and is __________.选择一项：

a.friendly b.brotherly

c.a mixture of love and hate d.impolite

题目7 完成满分1.00 What does the last sentence mean?

选择一项：

a.As long as the English Channel exists, no further disagreement will form between France and Britain.b.The English Channel can prevent anything unfriendly happening in both France and Britain.c.The English Channel is the largest enemy between France and Britain.d.Franc and Britain are near neighbors, and this will help balance the relationship between them.题目8 完成 满分1.00 The war in does _________ to the relationship between and.选择一项：

a.both good and harm b.neither good nor harm c.good d.harm

题目9 完成满分1.00 The British are not so friendly to________ and the French are not so friendly to _________.选择一项：

a.Germany;Germany b.America;Germany c.Germany;America d.America;America

题目10 完成满分1.00 ________ are more interested in having holidays in _________.选择一项：

a.British people„ Germany

b.French people„ Britain

c.American people„ Britain

d.British people„ France

阅读理解

请从每个问题后的A.B.C.D四个选项中选出正确选项。

Community service is an important component of education here at our university.We encourage all students to volunteer for at least one community activity before they graduate.A new community program called “One On One ” helps elementary students who’ve fallen behind.Your education majors might be especially interested in it because it offers the opportunity to do some teaching, that is, tutoring in math and English.You’d have to volunteer two hours a week for one semester.You can choose to help a child with math, English, or both.Half-hour lessons are fine, so you could do a half hour of each subject two days a week.Professor Dodge will act as a mentor to the tutors-he’ll be available to help you with lesson plans or to offer suggestions for activities.He has office hours every Tuesday and Thursday afternoon.You can sign up for the program with him and begin the tutoring next week.I’m sure you’ll enjoy this community service… and you’ll gain valuable experience at the same time.It looks good on your resume, too, showing that you’ve had experience with children and that you care about your community.If you’d like to sign up, or if you have any questions, stop by Professor Dodge’s office this week.题目11 完成满分1.00 What should students who are interested in the tutorials do? 选择一项：

a.Talk to professor Dodge.b.Submit a resume to the dean.c.Sign up for a special class.d.Contact the elementary school.题目12 完成满分1.00 Whom do you think the speaker addresses?

选择一项：

a.Graduated students.b.Students.c.Residents.d.Faculty.题目13 完成满分1.00 What is the purpose of the program that the speaker describes? 选择一项：

a.To help education majors prepare for final exams.b.To offer tutorials to elementary school students.c.To provide funding for a community service project.d.To find jobs for graduating students.题目14 完成满分1.00 What is the purpose of the talk? 选择一项：

a.To explain a new requirement for graduation.b.To interest students in a new community program.c.To recruit elementary school teachers for a special program.d.To discuss the problems of elementary school students.题目15 完成What does professor Dodge do?

选择一项：

a.He teaches part-time in an elementary school.b.He advises students to participate in certain program.c.He helps students prepare their resumes.d.He observes elementary school students in the classroom.

第三篇：西安交大网络教育《发电厂电气部分》在线作业答案

西交《发电厂电气部分》在线作业、单选题（共 20 道试题，共 40 分。）

1.采用双母线同时运行的双母线接线，具有单母线分段接线的特点，（）。A.因此双母线接线与单母线分段接线是等效的 B.但单母线分段接线具有更大的运行灵活性 C.并且两者的设备数量一样

D.但双母线接线具有更大的运行灵活性 满分：2 分

2.电压互感器的额定电压为3～35kV 时，一次绕组需经（）接入被测电路。A.隔离开关和接触器 B.隔离开关和高压熔断器 C.断路器和高压熔断器 D.断路器和限流电抗器 满分：2 分

3.信号装置按用途来分，不包括（）A.事故信号 B.预告信号 C.位置信号 D.闪烁信号 满分：2 分

4.220kv及以上变电所所用变压器接线组别宜采用（）A.ygn12 B.Dd12 C.Dyn11 D.Yd11 满分：2 分

5.中性点经消弧线圈接地一般采用（）A.欠补偿 B.全补偿 C.过补偿 D.不补偿 满分：2 分

6.发电机进相运行会导致（）A.静态稳定性降低 B.静态稳定性提高 C.无影响 D.无法确定 满分：2 分

7.以下不属于配电装置设备的是（）A.开关电器

B.保护和测量电器 C.发电机 D.母线

满分：2 分 8.为保证电器的动稳定，在选择电器时应满足（）条件。A.动稳定电流小于通过电器的最大两相冲击短路电流 B.动稳定电流大于通过电器的最大两相冲击短路电流 C.动稳定电流大于通过电器的最大三相冲击短路电流 D.动稳定电流小于通过电器的最大三相冲击短路电流 满分：2 分

9.减小矩形母线应力的最有效方法是()A.改变母线的布置 B.增大母线截面

C.减少同一相中两个相邻绝缘子间的距离 D.增加母线相间距离 满分：2 分

10.少油断路器中的绝缘油（）。A.灭弧介质和冷却介质

B.灭弧介质及触头间隙绝缘介质

C.灭弧介质以及触头间隙、带电部分与地之间的绝缘介质 D.以上都不对 满分：2 分

11.验算裸导体短路热效应的计算时间，采用（）A.主保护动作时间

B.主保护动作时间加断路器全分闸时间 C.后备保护动作时间加断路器全分闸时间 D.后备保护动作时间 满分：2 分

12.三相电动力计算公式中的形状系数Kf决定于（）A.导体的机械强度 B.导体的形状 C.导体的布置位置

D.导体的形状及相对位置 满分：2 分

13.电力系统中，并联电抗器主要用来（）A.限制故障时的短路电流 B.吸收电网中的容性无功 C.给系统提供容性无功 满分：2 分

14.以下高压设备，一般只在屋外使用的是（）A.高压断路器 B.高压负荷开关 C.高压隔离开关

D.跌落式高压熔断器 满分：2 分

15.断路器的开断时间是指从接受分闸命令瞬间起到（）A.所有电弧触头均分离的瞬间为止 B.各极触头间电弧最终熄灭为止 C.首相触头电弧熄灭为止 D.主触头分离瞬间为止 满分：2 分

16.电能与其他形式的能源相比，其特点不包括（）A.便于大规模生产和远距离输送 B.方便转换和易于控制 C.可以大量储存 D.损耗小 满分：2 分

17.线路停电的操作顺序是（）

A.先分母线隔离开关，再分线路隔离开关，最后分断路器 B.先分线路隔离开关，再分母线隔离开关，最后分断路器 C.先分断路器，再分母线隔离开关，最后分线路隔离开关 D.先分断路器，再分线路隔离开关，最后分母线隔离开关 满分：2 分

18.多油断路器中油的用途是（）A.灭弧介质和冷却介质

B.灭弧介质及触头间隙绝缘介质

C.灭弧介质以及触头间隙、带电部分与地之间的绝缘介质 D.以上都不对 满分：2 分

19.某变电所220千伏配电装置的布置形式为两组母线上下布置，两组母线隔离开关亦上下重叠布置而断路器为双列布置，两个回路合用一个间隔。这种布置方式称为（）。A.半高型布置 B.普通中型布置 C.分相中型布置 D.高型布置 满分：2 分

20.中性点非直接接地系统中发生单相金属性接地时，故障相对地电压为零，非故障相对地电压等于（）。A.电源相电压 B.电源线电压 C.100 伏 D.380 伏 满分：2 分

西交《发电厂电气部分》在线作业 试卷总分：100

测试时间：--单选题 多选题 判断题、多选题（共 10 道试题，共 20 分。）

1.电力系统中，电气设备选择的一般条件是（）A.按正常工作条件选择电气设备 B.按短路状态选择电气设备 C.按正常的工作条件校验 D.按短路状态校验 满分：2 分

2.采用全连分相封闭母线，与敞露母线相比，具有的优点包括（）A.供电可靠 B.运行安全

C.母线点动力减小 D.运行维护工作量小 满分：2 分

3.对电力系统运行的基本要求有（）A.保证对用户供电的可靠性 B.保证电能的良好质量 C.保证运行的最大经济性 D.必须有大量的电力存储 满分：2 分

4.在超高压输电线路上一般要装设并联高压电抗器，其作用包括（）A.限制工频电压升高 B.降低操作过电压

C.消除发电机带长线出现自励磁

D.避免长距离输送无功功率并降低线损 满分：2 分

5.配电装置表达图中需要按比例绘制的是（）A.平面图 B.配置图 C.断面图 D.示意图 满分：2 分

6.发热对电气设备的影响有（）A.使绝缘材料的绝缘性能降低 B.使金属材料的机械强度下降 C.使导体接触部分的接触电阻增加 D.无影响 满分：2 分

7.电气设备的运行状态有哪几种?()A.运行

B.热状态备用中 C.冷状态备用中 D.检修中 满分：2 分

8.发电厂的厂用电源，必须供电可靠，且能满足各种工作状态的要求，按功能分为（）A.工作电源 B.启动电源 C.备用电源

D.事故保安电源 满分：2 分

9.影响输电电压等级发展的主要原因有（）A.长距离输送电能 B.大容量输送电能

C.节省基建投资和运行费用 D.电力系统互联 满分：2 分

10.直流输电的优点有()A.线路造价低、年运行费用省 B.没有运行稳定问题 C.能限制短路电流

D.调节速度快，运行可靠 满分：2 分

西交《发电厂电气部分》在线作业 试卷总分：100

测试时间：--单选题 多选题 判断题、判断题（共 20 道试题，共 40 分。）

1.中央信号装置分为事故信号和预告信号()A.错误 B.正确

满分：2 分

2.SF6气体具有较高绝缘强度的主要原因之一是电负性。（）A.错误 B.正确

满分：2 分

3.加装旁路母线的唯一目的是不停电检修出线断路器。（）A.错误 B.正确

满分：2 分

4.将电气设备由一种状态转为另一种状态的操作称为倒闸操作。（）A.错误 B.正确

满分：2 分

5.串联电抗器主要用来限制故障时的短路电流。()A.错误 B.正确

满分：2 分

6.多角形接线主要适用于具有3-5回线路。（）A.错误 B.正确

满分：2 分

7.并联电抗器主要是用来吸收电网中的容性无功。()A.错误 B.正确

满分：2 分

8.电流互感器二次侧可以短路，但不能开路。()A.错误 B.正确

满分：2 分

9.双回线中任一回线路停电时，先拉开送端开关，然后再拉开受端开关。送电时，先合受端开关，后合送端开关。()A.错误 B.正确

满分：2 分

10.厂用电耗电量占发电厂全部发电量的百分比，称为厂用电率。（）A.错误 B.正确

满分：2 分

11.电力系统中的发电机及各电压等级的变压器的中性点，都是电力系统的中性点。（）A.错误 B.正确

满分：2 分

12.电气设备选择的一般条件是按正常工作条件选择电气设备、按短路状态校验。（）A.错误 B.正确

满分：2 分

13.对称三相电路丫连接时，线电压为相电压的√3倍。()A.错误 B.正确

满分：2 分

14.发电厂是把一次能源转换成电能的工厂。（）A.错误 B.正确

满分：2 分 15.按电气设备装设地点不同，配电装置可分为屋内配电装置和屋外配电装置。（）A.错误 B.正确

满分：2 分

16.内桥接线适用于线路较长、容量较小和变压器需经常切换运行方式的装置中。（）A.错误 B.正确

满分：2 分

17.在倒闸操作中，起用母线时，应遵循先充电检查，后接入使用的原则。（）A.错误 B.正确

满分：2 分

18.设计配电装置的带电部分之间、带电部分与地或者通道路面之间的距离，均应小于规范中所规定的安全净距。（）A.错误 B.正确

满分：2 分

19.变电所起着改变电能电压和分配电能的作用。（A.错误 B.正确

满分：2 分

20.事故信号的主要任务是在断路器事故跳闸时，能及时地发出音响，并作相应的断路器灯位置信号闪光。()A.错误 B.正确

满分：2 分

第四篇：西安交大电路在线作业

一、单选题（共 20 道试题，共 40 分。）1.电感元件L1与L2并联，其等效电感L=（D）A.L1+L2 B.L1-L2 C.L1L2 D.L1L2/（L1+L2）

满分：2 分

2.一根粗细均匀的电阻丝，阻值为25Ω，将其等分成五段，然后并联使用，则其等效电阻是（C）A.1/25Ω B.1/5Ω C.1Ω

D.5Ω

满分：2 分

3.下列叙述正确的是（C）

A.电容上的电压越大，则通过该电容的电流越大

B.电容上的电压越大，则通过该电容的电流越大

C.电容电压的绝对值在某时刻达到最大值时，此时电容储能也最大 D.若电容上某时刻电压为零，则该时刻电容上的电流一定为零

满分：2 分

4.若C = 1F ,某时刻电容两端电压u为2V，则此时流过电容的电流＝（D）。A.2A B.0.5A C.-2A D.不能确定

满分：2 分

5.若RLC串联电路的谐振角频率为w0，则在角频率w>w0时电路呈现（B）A.纯电阻性 B.电感性 C.电容性

D.不能确定

满分：2 分

6.当电路中存在受控源时和在非线性电路中，叠加定理是否适用（A）。A.均适用

B.均不适用

C.前者不适用，后者适用 D.前者适用，后者不适用

满分：2 分

7.额定值为1W 10Ω的电阻器使用时通过电流的限额是（C）。A.0.1A B.0.2A C.0.316A D.0.5A

满分：2 分 8.R=10Ω,C=1uF与电感L串联，接到频率为1000Hz的正弦电压源上，为使电阻两端电压达到最高，电感L应取：（D）A.1H B.1/2лH C.1/2H D.1/4л2H

满分：2 分

9.只具有存储磁场能量特性的电路元件是指（B）A.电阻元件 B.电感元件 C.二极管元件 D.电源元件

满分：2 分

10.理想电流源的内阻为(B).A.0 B.∞

C.有限值

D.由外电路来确定

满分：2 分

11.当RLC串联电路发生谐振时，下列（A）是错误的。A.电流最小 B.电流最大

C.阻抗模值最小 D.电压电流同相

满分：2 分

12.集总参数电路的最大尺寸满足（A）A.略微大于电磁波波长 B.略微小于电磁波波长 C.远远大于电磁波波长 D.远远小于电磁波波长

满分：2 分

13.在三相四线制电路中,通常所说的220伏和380伏指的是电压的(C)值 A.平均 B.最大 C.有效 D.瞬时

满分：2 分

14.将标明220V、100W的灯泡接在电压低于220V的电源上，灯泡实际消耗的功率（C）A.仍为100W B.0W C.小于100W D.大于100W

满分：2 分

15.理想电感元件在某时刻其电压值为0，则该时刻电感上的储能（A）A.不一定为0 B.一定为0 C.一定不为0 D.无法确定

满分：2 分

16.一个实际电路的电路模型（B）A.是唯一的

B.在不同应用条件下可以有不同的形式 C.是具有某种确定电磁性质的真实元件 D.不具有精确的数学定义

满分：2 分

17.理想电压源、理想电流源在电路中的功率（A）A.与外电路无关 B.仅由外电路决定

C.由电源本身与外电路共同决定 D.仅由电源本身决定

满分：2 分

18.正电荷从元件上电压的“＋” 极经元件运动到元件的“-”极，电场力做的是（A），这时，元件（）能量。A.做正功 吸收 B.做正功 释放

C.做负功 吸收 D.做负功 释放

满分：2 分

19.下列各部分中，哪一个不是线性电路的组成部分（D）。A.时不变线性无源元件 B.线性受控源 C.独立电源 D.集总元件

满分：2 分

20.电路中理想电压源两端电压（A）A.与外电路无关 B.由外电路决定

C.为不一定为0的恒定值 D.恒为0

满分：2 分

二、判断题（共 30 道试题，共 60 分。）

1.当三相电源对称，负载对称时，中线电流为０，因而可以取消中线。B A.错误

B.正确

满分：2 分

2.三相负载三角形联接时,测出各线电流都相等,则各相负载必然对称B A.错误 B.正确

满分：2 分

3.电流相等的两个元件必属串联,电压相等的两个元件必属并联。A A.错误 B.正确

满分：2 分

4.仅改变三相对称电源的频率是不影响三相对称负载吸收的有功功率的。B A.错误

B.正确

满分：2 分

5.若电路有ｎ个节点，按不同节点列写的ｎ－１个ＫＣＬ方程必然相互独立。B A.错误 B.正确

满分：2 分

6.若二端网络Ｎ与某电流源相联时端电压为６Ｖ，则在任何情况下二端网络Ｎ对外都可以用６Ｖ电压源代替。A A.错误

B.正确

满分：2 分

7.在对称三相电路中,任何时刻,三相负载吸收的总的瞬时功率和平均功率都是一个常数。B A.错误 B.正确

满分：2 分

8.同一个一阶电路的零状态响应、零输入响应和全响应具有相同的时间常数.B A.错误 B.正确

满分：2 分

9.正弦电流通过电感或电容元件时,若电流为零则电压绝对值最大,若电流最大则电压为零。B A.错误 B.正确

满分：2 分

10.叠加定理不仅适用于线性电路，也适用于非线性电路。如小信号法解非线性电路就是用叠加定理。A A.错误

B.正确

满分：2 分

11.电压源在电路中一定是发出功率的。A A.错误 B.正确

满分：2 分

12.一个二端元件的伏安关系完全是由它本身所确定的，与它所接的外电路毫无关系。B A.错误 B.正确

满分：2 分 13.戴维南定理只适用于线性电路。但是负载支路可以是非线性的。B A.错误 B.正确

满分：2 分

14.星形联接电压源供电给星形联接负载时,如中点偏移电压越大, 则负载各相电压越小。A A.错误 B.正确

满分：2 分

15.采用非关联参考方向时,电感电流比电压超前π/2rad, 电容电流比电压滞后 π/2rad。B A.错误 B.正确

满分：2 分

16.根据Ｐ=ＵＩ,对于额定值220V、40W的灯泡,由于其功率一定，电源电压越高则其电流必越小。A A.错误 B.正确

满分：2 分

17.正弦电流电路中,频率越高则电感越大,而电容则越小。A A.错误

B.正确

满分：2 分

18.理想变压器即不消耗能量,也不贮存能量.B A.错误 B.正确

满分：2 分

19.在电压近似不变的供电系统中，负载增加相当于负载电阻减少。B A.错误

B.正确

满分：2 分

20.空心变压器副绕组如接感性负载，则反映到原绕组的引入电抗一定是容性电抗。B A.错误 B.正确

满分：2 分

21.列写ＫＶＬ方程时,每次一定要包含一条新支路才能保证方程的独立性。B A.错误 B.正确

满分：2 分

22.在Ｒ、Ｃ串联电路中，由于时间常数与电阻成正比，所以在电源电压及电容量固定时，电阻越大则充电时间越长，因而在充电过程中电阻上消耗的电能也越多。A A.错误 B.正确

满分：2 分

23.若某元件的伏安关系为u＝2i+4，则该元件为线性元件。B A.错误 B.正确

满分：2 分

24.在计算电路的功率时，根据电压、电流的参考方向可选用相应的公式计算功率。若选用的公式不同,其结果有时为吸收功率，有时为产生功率。A A.错误

B.正确

满分：2 分

25.在ＲＬ串联电路与正弦电压接通时,•电流自由分量的初值总与稳态分量的初值等值反号。(初始状态为零)B A.错误 B.正确

满分：2 分

26.电感元件电压相位超前于电流π/2ｒad,所以电路中总是先有电压后有电流。A A.错误

B.正确

满分：2 分

27.阻值不同的几个电阻相串联，阻值大的电阻消耗功率小。A A.错误 B.正确

满分：2 分

28.若两个有源二端网络与某外电路相联时，其输出电压均为Ｕ，输出电流均为Ｉ，则两个有源二端网络具有相同的戴维南等效电路。A A.错误 B.正确

满分：2 分

29.理想电流源中的电流是由它本身确定的，与外电路无关。因此它的端电压则是一定的，也与外电路无关。A A.错误 B.正确

满分：2 分

30.两只额定电压为110V的电灯泡串联起来总可以接到220V的电压源上使用。A A.错误

B.正确

满分：2 分

第五篇：交大网络教育《马克思主义基本原理》作业1：学习体会

马克思主义哲学主要对我们学生进行唯物主义哲学的基本原理教育，使我们掌握马克思主义哲学的基本观点、立场和方法；帮助我们掌握 马克思主义的世界观和方法论；帮助我们树立正确的人生观和价值 观；培养学生运用马克思主义哲学的观点和方法去分析问题、解决 问题的能力，提高我们的政治理论素质和思维水平，为我们正确理 解马克思主义，确立社会主义信念自觉坚持党的路线、方针和政策 打下坚实的基础。马克思主义哲学是19世纪40年代，马克思和恩格 斯根据无产阶级反对资产阶级的斗争的实践需要，在总结当时的自 然科学的最高成果、批判地吸取历史上一切优秀的思想文化成果、特别是德国古典哲学的基础上创立的。马克思主义哲学同一切旧哲 学相比，具有科学性、阶级性、实践性三个本质特征。马克思主义 哲学的内容：辩证唯物主义和历史唯物主义。作为一种自然观,辨

证唯物主义是指自然具有自在性、规律性、联系运动的矛盾辨证性;作为一种认识论和实践论,辨证唯物主义是指正确认识最终来源于

感官的感觉和主体的物质实践活动,认识和实践在认识、实践、认识、实践的辨证运动中相互促进发展。