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直流电机的换向极绕组一般和电枢绕组并联。()

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SS8型电力机车磁场削弱为晶闸管分路无级削弱。()

The selection says that trends are toward the______.

A. growth of cities and shrinking of suburban areas
B. growth of both rural and suburban areas
C. shrinking of urban and suburban areas
D. growth of urban and suburban areas

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晶体管开关电路利用的是三极管的放大特性。()

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三相异步电动机运行时，若转差率为零则电磁转矩也为零。()

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