【判断题】
>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
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相关试题
【判断题】
>钻小孔时应选择较大的进给量和较低的转速
【判断题】
>静电最主要的危害就是可能引起火灾和爆炸事故
【判断题】
>在带有电容器的供电线路停电作业时，只要断开电源后即可进行检修工作
【判断题】
>三相三线有功电能表能够准确计量三相四线制电路的有功电量
【判断题】
>单相变压器一、二次绕组的同名端同时取为首端(或末端)时，一、二次绕组的相电压U1和U2应为同相位
【判断题】
>自耦变压器降压启动结束后，自耦变压器的高压绕组仍与电源连接，不必切除，只把其低压绕组与电机定子切除即可
【判断题】
>电机电刷磨损后，应按电机制造厂规定的同一型号进行更换
【判断题】
>如果电机的轴承没有洗净或润滑脂内有杂质、水分，轴承极易损坏
【判断题】
>起重设备和吊装工具规格应比起吊设备或工件的重量小
【判断题】
>机床电气设备发生故障后，修理前一般先进行调查研究，即通过看、问、听、摸等办法了解故障及可能原因，再进行原理分析、故障排除
【判断题】
>在继电器或接触器中，额定交、直流电压相同的线圈之间可以互换使用
【判断题】
>电阻降压启动方法设备简单，启动时电阻消耗功率较大，一般很少采用
【判断题】
>未事先通知用电人自行中断停电，造成用电人损失的，应当承担损失赔偿责任
【判断题】
>在三相四线制低压供电网中，三相负载越接近对称，其中性线电流就越小
【判断题】
>交流电桥主要用来测量电感、电容、和阻抗等参数
【判断题】
>在机床电气线路中异步电机常用的保护环节有短路、过载、失压和欠压
【判断题】
>一般低压验电笔只能验明220 V的电压
【判断题】
>电力变压器绝缘管的作用是作为引出线的接线端子
【判断题】
>电焊变压器空载时副边能产生足够的引弧电压
【判断题】
>接触器银触头表面的氧化层对接触效果没有太大影响，维修时不必刮去
【判断题】
>交流接触器铁芯上的短路环断裂后会使动静铁芯不能释放
【判断题】
>一般来说，继电器的质量越好，接线越简单，所包含的接点数目越少，则保护装置的动作越可靠
【判断题】
>1kV及1kV以下的电缆一般可不做耐压试验
【判断题】
>选择仪表量限时，应尽量使表针接近满刻度偏转，以保证测量的准确性
【判断题】
>机床电气维修结束后，不用做维修记录，保证机床运转即可
【判断题】
>电阻降压启动时，启动转矩只有全压启动的1/3
【判断题】
>如果功率表的接线正确，但发现指针反转，则应将电流端钮换接
【填空题】
1.>母线相序的色别规定L1相为___色，L2相为绿色，L3相为红色。
【填空题】
2.>电路有开路、短路和___三种状态。
【填空题】
3.>錾削时錾子的握法有正握、反握和___。
【填空题】
4.>任何电气线路、设备未经本人验电以前一律视为___，不准触及。
【填空题】
5.>向电力用户供应电能应符合___三个基本要求。
【填空题】
6.>三相异步电动机常用的三种降压启动方法：星/角降压启动、自耦变压器降压启动、___降压启动。
【填空题】
7.>三相异步电动机常用的电气制动方法是能耗制动、反接制动、___。
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【单选题】
The main duty of the British Privy Council is to .
A. A. make decisions
B. B. give advice
C. C. pass bills
D. D. supervise the Cabinet
【单选题】
is the first African-American winner of the Nobel Prize for Literature.
A. A.Ralph Ellison
B. B. Tony Morrison
C. C. Richard Wright
D. D. James Baldwin
【单选题】
Of the following writers, is Not a Nobel Prize winner.
A. A. Alice Walker
B. B. Ernest Hemingway
C. C. William Faulkner
D. D. Eugene O’Neil
【单选题】
Of the following books, is NOT written by Ernest Hemingway.
A. A. The Sun Also Rises
B. B. The Sound and the Fury
C. C. A Farewell to Arms
D. D. For Whom the Bell Tolls
【单选题】
F. Scott Fitzgerald’s finest novel is , and its theme is about
A. A. The Great Gatsby, the American Dream
B. B. Tender is the Night, love
C. C. Tales of the Jazz Age, the loss of oneself
D. D. The Beautiful and the Damned, the evil of human nature
【单选题】
Of the following writers, is NOT included in the group of naturalists.
A. A. Stephen Crane
B. B. Frank Norris
C. C. Theodore Dreiser
D. D. Herman Melville
【单选题】
Of the following, is NOT characteristic of Mark Twain’s works.
A. A. colloquial speech
B. B. a sense of humor
C. C. a realistic view
D. D. an idealistic view
【单选题】
Of the following, is considered Herman Melville’s masterpiece.
A. A. The Last of the Mohicans
B. B. The Legend of Sleepy Hollow
C. C. Moby Dick
D. D. Daisy Miller
【单选题】
Of the following, is NOT Nathaniel Hawthorne’s work.
A. A. The Scarlet Letter
B. B. The House of the Seven Gables
C. C. The Marble Faun
D. D. Nature
【单选题】
is regarded as “the father of American literature”.
A. A. James Fennimore Cooper
B. B. Ralph Waldo
C. C. Thomas Jefferson
D. D. Washington Irving
【单选题】
Of the following writers, are from the Colonial and Revolutionary Periods.
A. A. Benjamin Franklin & Edgar Ellen Poe
B. B. Edgar Ellen Poe & Jonathan Edwards
C. C. Benjamin Franklin & Jonathan Edwards
D. D. Edgar Ellen Poe & Washington Irving
【单选题】
The National Day of the United States falls on .
A. A. June 4th
B. B. July 4th
C. C. June 14th
D. D. July 14th
【单选题】
Of the following, is NOT among the three major radio and TV networks in America.
A. A. the National Broadcasting System (NBS)
B. B. the Public Broadcasting Service (PBS)
C. C. the Columbia Broadcasting System (CBS)
D. D. the American Broadcasting System (ABS)
【单选题】
is sold especially to the upper or upper-middle class and it has a reputation for its serious attitude and great bulk.
A. A. The Washington Post
B. B. The New York Times
C. C. Los Angeles Times
D. D. New York Daily News
【单选题】
Of the following universities, has NOT cultivated any American President yet.
A. A. Harvard University
B. B. Massachusetts Institute of Technology
C. C. Princeton University
D. D. Yale University
【单选题】
To get a bachelor’s degree, all undergraduate students are required to do the following except .
A. A. attending lectures and completing assignments
B. B. passing examinations
C. C. working for communities
D. D. earning a certain number of credits
【单选题】
Of the following, is NOT the responsibility of the board of trustees in U. S. institutions.
A. A. choosing the president
B. B. establishing policies for administrators and faculty
C. C. approving budget and other financial project
D. D. decide which student to enroll
【单选题】
Of the following, are NOT among the categories of American higher education.
A. A. universities and colleges
B. B. research institutions
C. C. technical institutions
D. D. community colleges
【单选题】
Higher education in the United States began with the founding of
A. A. Yale University
B. B. Harvard University
C. C. Princeton University
D. D. New York University
【单选题】
Of the following subjects, are NOT offered to elementary school students.
A. A. mathematics and languages
B. B. politics and business education
C. C. science and social studies
D. D. music and physical education
【单选题】
Formal education in the United States consists of , secondary and higher education.
A. A. kindergarten
B. B. public
C. C. elementary
D. D. private
【单选题】
At present, U. S. exports account for of the world’s total.
A. A. 10%
B. B. 15%
C. C. 20%
D. D. 25%
【单选题】
is not one of the three giants in American automobile industry.
A. A. Ford
B. B. General Motors
C. C. Chrysler
D. D. American Motors
【单选题】
The following statements are all true except .
A. A. Agribusinesses reflect the big, corporate nature of many farm enterprises.
B. B. Agribusinesses maintain a balanced trade pattern between agricultural imports and exports.
C. C. Agribusinesses range from one-family corporations to multinational firms.
D. D. Agribusinesses include a variety of farm businesses and structures.
【单选题】
About of American crops are for export.
A. A. half
B. B. one third
C. C. one fourth
D. D. one fifth
【单选题】
President Johnson tried to build a “Great Society” by introducing various programs like the following except .
A. A. Medicare
B. B. Food Stamps
C. C. Education Initiatives
D. D. Unemployment Pension
【单选题】
The following inventions took place during the “second indThe following inventions took place during the “second industrial revolution” except .
A. A. typewriter
B. B. telephone
C. C. electric light
D. D. refrigerator
【单选题】
The first National Bank of the United States was established with the urge of .
A. A. George Washington
B. B. Thomas Jefferson
C. C. Andrew Jackson
D. D. Alexander Hamilton
【单选题】
Chartered companies were NOT granted the by the British King or Queen.
A. A. political authority
B. B. economic rights
C. C. judicial authority
D. D. diplomatic authority
【单选题】
The modern American economy progressed from to , and eventually, to .
A. A. colonial economy, handcraft economy, industrial economy
B. B. farming economy, handcraft economy, industrial economy
C. C. colonial economy, farming economy, industrial economy
D. D. handcraft economy, farming economy, industrial economy
【单选题】
America produces a major portion of the world’s products in the following fields except .
A. A. machinery
B. B. automobiles
C. C. ore
D. D. chemicals
【单选题】
The President is directly voted into office by .
A. A. all citizens of America
B. B. the citizens over 18 years old
C. C. electors elected by the voters
D. D. the senators and representatives
【单选题】
The Supreme Court is composed of justices.
A. A. six
B. B. seven
C. C. eight
D. D. nine
【单选题】
The terms for a Senator and Representative are and years respectively.
A. A. two, four
B. B. two, three
C. C. two, six
D. D. six, two
【单选题】
According to the Constitution, a candidate for President must be .
A. A. at least 35 years old
B. B. at least a 14 years’ resident of the United States
C. C. born in America
D. D. all of the above
【单选题】
The following except are all powers of the President.
A. A. vetoing any bills passed by Congress
B. B. appointing federal judges when vacancies occur
C. C. making laws
D. D. issuing executive orders
【单选题】
All the following except cannot make legislative proposal.
A. A. the Senator
B. B. the Representative
C. C. the Secretary of State
D. D. the President
【单选题】
The following except are guaranteed in the Bill of Rights.
A. A. freedom of religion
B. B. the right to get into people’s house by police
C. C. freedom of speech and of press
D. D. the right to own one’s weapon if one wishes
【单选题】
The Bill of Rights .
A. A. defines the rights of Congress and the rights of the President
B. B. guarantees citizens of the United States specific individual rights and freedoms
C. C. is part of the Declaration of Independence
D. D. has no relationship with the Constitution
【单选题】
The Constitution of the United States .
A. A. gives the most power to Congress
B. B. gives the most power to the President
C. C. tries to give each branch enough power to balance the others
D. D. gives the most power to the Supreme Court
