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【单选题】
下面对三相异步电动机在异步运行时,叙述正确的是 ( )A.
转子转速n2等于同步转速n1
B.
转子转速范围n1>n2>0
C.
转子启动瞬间，n2=0，所以转差率S=1
D.
因为 ，所以可得0
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