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问题

In order to change the direction of rotation of a D.Cmotor _____(1) the field leads must b


In order to change the direction of rotation of a D.Cmotor _____(1) the field leads must be changed; (2) the input leads must be changed

A.(1) only

B.(2) only

C.either (1) or (2)

D.neither (1) or (2)

请帮忙给出正确答案和分析,谢谢!

参考答案
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