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三相异步电动机空载运行时，其转差率为（）

A、S=0

B、S=0.004~0.007

C、S=0.01~0.07

D、S=1

时间：2021-07-19 02:40 关键词：机械制造与自动化高起专机电控制系统 2020年第二学期期末考试

答案解析

B
B

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