题目内容

工厂供电系统中一般采用的是二次重合闸技术,即断路器被继电保护装置控制跳闸后,尝试重合两次恢复供电。

A. 对
B. 错

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It is almost 3 years ___we saw each other last time.

A. before
B. since
C. after
D. when

__ you call me to say you're not coming, I’ll see you at the office.

A. Though
B. Whether
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A. becuase
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A. since
B. while
C. when
D. as

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