若流过晶闸管的电流的波形分别为全波、半波、导通角为120的方

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问题多项选择题

若流过晶闸管的电流的波形分别为全波、半波、导通角为120的方波、导通角为90的方波时，则对应的电流波形系数分别为（）。

A、1.11

B、2.22

C、1.57

D、1.73

E、1.41

答案

参考答案：A, C, D

选择题

Only by shouting at the top of his voice__________. .

A．he was able to make himself hear

B．he was able to make himself heard

C．was he able to make himself hear

D．was he able to make himself heard

单项选择题

凿岩机的冲击频率为3000次/分，它是属于（）凿岩机。

A.低频

B.高频

C.中频