题目内容

三相全控桥式整流电路带大电感负载时,品闸管承受的最大正向电压为

A. 2.282U₂Φ
B. 1.414 U₂φ
C. 2.45 U₂Φ
D. 1.732 U₂Φ

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三相全控桥式整流电路带大电感负载时,在负载二端续流二极管。

A. 必须要接
B. 不可接 D.必须串联连接
C. 可接可不接

三相半控桥式整流电路带电阻负载时,其输出直流电压的波形在的范围内是连续的。

A. a<60°
B. a<30°
C. 30° D. a>30°

Carly was named“The Most Powerful Woman in Business“byBusiness Week in1999.

A. 对
B. 错

Carly started her business career from Assistant’s desk to CEO due to her own efforts.

A. 对
B. 错

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