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异步与同步电动机的概念

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异步电动机的主要用途及优缺点

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

The coming public performance, her first one, will certainly put the young singer to the test.

A. 大获成功
B. 使......接受考验
C. 使......面临曝光
D. 大展身手