【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
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答案
B
解析
暂无解析
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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
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Formal education in the United States consists of , secondary and higher education.
A. A. kindergarten
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At present, U. S. exports account for of the world’s total.
A. A. 10%
B. B. 15%
C. C. 20%
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is not one of the three giants in American automobile industry.
A. A. Ford
B. B. General Motors
C. C. Chrysler
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The following statements are all true except .
A. A. Agribusinesses reflect the big, corporate nature of many farm enterprises.
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About of American crops are for export.
A. A. half
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President Johnson tried to build a “Great Society” by introducing various programs like the following except .
A. A. Medicare
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The first National Bank of the United States was established with the urge of .
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Chartered companies were NOT granted the by the British King or Queen.
A. A. political authority
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The modern American economy progressed from to , and eventually, to .
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America produces a major portion of the world’s products in the following fields except .
A. A. machinery
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The President is directly voted into office by .
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The Supreme Court is composed of justices.
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According to the Constitution, a candidate for President must be .
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The following except are all powers of the President.
A. A. vetoing any bills passed by Congress
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All the following except cannot make legislative proposal.
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The following except are guaranteed in the Bill of Rights.
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The Bill of Rights .
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The U. S. Constitution came into effect in .
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President applied New Deal to deal with the problems of the Great Depression.
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A. A. neutrality
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“No taxation without representation” was the rallying slogan of .
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The characteristic of dominant American culture is .
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is located on the U. S. –Canadian border between Lake Erie and Lake Ontario.
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32.用于指示电动机正处在停止状态的指示灯颜色应选用___。
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34.选用LED指示灯的优点之一是___。
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35.BK系列控制变压器通常用作机床控制电器局部___及指示的电源之用。
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36.对于环境温度变化大的场合,不宜选用___时间继电器。
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37.对于延时精度要求较高的场合,可采用___时间继时器。
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38.控制两台电动机错时启动的场合,可采用___时间继电器。
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B. 气动型
C. 通电延时型
D. 断电延时型
【单选题】
39.控制两台电动机错时停止的场合,可采用___时间继电器。
A. 通电延时型
B. 断电延时型
C. 气动型
D. 液压型
【单选题】
40.压力继电器选用时首先要考虑所测对象的___,还有要符合电路中的额定电压,接口管径的大小。
A. 压力范围
B. 压力种类
C. 压力方向
D. 压力来源
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41.压力继电器选用时首先要考虑所测对象的压力范围,还要符合电路中的额定 电压,___,所测管路接口管径的大小。
A. 触点的功率因数
B. 触点的电阻率
C. 触点的绝缘等级
D. 触点的电流容量
【单选题】
42.设计多台电动机顺序控制线路的目的是保证操作过程的合理性和___。
A. 工作的安全可靠
B. 节约电能的要求
C. 降低噪声的要求
D. 减小振动的要求
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43.多台电动机的顺序控制线路___。
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B. 不包括顺序停止
C. 不包括顺序启动
D. 通过自锁环节来实现
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44.以下属于多台电动机顺序控制的线路是___。
A. 一台电动机正转时不能立即反转的控制线路
B. Y-A启动控制线路
C. 电梯先上升后下降的控制线路
D. 电动机2可以单独停止,电动机1停止时电动机2也停止的控制线路
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45.以下属于多台电动机顺序控制的线路是___。
A. Y-A启动控制线路
B. 一台电动机正转时不能立即反转的控制线路
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【单选题】
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【单选题】
49.下列不属于位置控制线路的是___。
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50.下列属于位置控制线路的是___。
A. 走廊照明灯的两处控制电路
B. 电风扇摇头电路
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【单选题】
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D. 补偿绕组
【单选题】
52.三相异步电动机能耗制动时,机械能转换为电能并消耗在___回路的电阻上。
A. 励磁
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D. 转子
【单选题】
53.三相异步电动机采用___时,能量消耗小,制动平稳。
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B. 回馈制动
C. 能耗制动
D. 反接制动
【单选题】
54.三相异步电动机能耗制动的过程可以用___来控制。
A. 电流继电器
B. 电压继电器
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【单选题】
55.三相异步电动机能耗制动的过程可以用___来控制。
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C. 热继电器
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【单选题】
56.三相异步电动机能耗制动的控制线路至少需要___个按钮。
A. 2
B. 1
C. 4
D. 3
【单选题】
57.三相异步电动机反接制动时,___绕组中通入相序相反的三相交流电。
A. 补偿
B. 励磁
C. 定子
D. 转子
【单选题】
58.三相异步电动机的各种电气制动方法中,能量损耗最多的是___。
A. 反接制动
B. 能耗制动
C. 回馈制动
D. 再生制动
【单选题】
59.三相异步电动机反接制动,转速接近零时要立即断开电源,否则电动机会___。
A. 飞车
B. 反转
C. 短路
D. 烧坏