题目内容

直流电机感应电动势和电磁转矩计算公式中的磁通Φ为( )。

A. 主极每极磁通
B. 电枢每极磁通
C. 每极合成磁通
D. 磁极总磁通

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直流电机电枢磁场在一对磁极下呈现( )。

A. 马鞍形分布
B. 正弦分布
C. 三角形分布
D. 梯形分布

Listen carefully and choose the phrase you hear.

A. first of all
B. after all

Listen carefully and choose the phrase you hear.

A. come out
B. come in

Listen carefully and choose the phrase you hear.

A. keep going
B. keep off

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