单项选择题
A.0.5MΩ B.0.38MΩ C.1MΩ D.10MΩ
A.电源相序 B.转子转速 C.负载转矩 D.电源频率
A.970 B.1455 C.2910
A.2 B.1 C.3 D.4
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