题目内容

当电网发生三相短路时，接在短路点附近的电动机有可能转为发电机运行。

A. 对
B. 错

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在低压电网中，两相短路时的短路电流等于同一地点三相短路电流的一半。

A. 对
B. 错

在无限容量系统中，周期分量假想时间等于短路延续时间。

A. 对
B. 错

I owe aof thanks to him because his support helped me overcome that difficulty.

A. respect
B. resposibility
C. duty
D. debt

Many people are ready to help you, but, to some, you must be on your own in most cases.

A. reason
B. extent
C. amount
D. goal