题目内容

流过电流的转子导体在磁场中要受到电磁力作用,力F的方向可用右手定则确定

A. 对
B. 错

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My brother and I _____ walking the family dog.

A. by turns
B. in turn
C. take turns
D. on turn

It is said that these sandstorms _____ the desert.

A. derive in
B. originate in
C. come in
D. strive in

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