题目内容

Complete the following statements according to what you have heard. (注意所填单词形式)1. According to the speaker, one of the greatest generation gaps in history was the one between (1)_______________and their (2)_____________and (3)_____________________.2. People refusing to go to war in 1942 were considered (4)_______________________; whereas many Boomers protested the war in Vietnam because they (5)_________________its morality.3. The speaker’s father, having grown up in (6)______________________times, doesn’t care much for (7)___________________and (8)__________________(两个词).

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实验三和实验四

电流速断保护的动作电流整定原则为:

A. 躲过线路末端的相间短路的最小短路电流
B. 躲过线路末端的相间短路的最大短路电流
C. 躲过线路首端的相间短路的最小短路电流
D. 躲过线路首端的相间短路的最大短路电流

IT系统当发生相对其设备外露可导电部分漏电时,其故障电流为

A. 单相短路电流
B. 两相短路电流
C. 三相短路电流
D. 电容电流

下列哪些属于二次回路或二次设备?

A. 工厂供配电监控主站的计算机
B. 断路器的灯光指示机构
C. 控制电容器投切的电路
D. 保护一次主电路的熔断器

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