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【单选题】
一台六极三相异步电动机,接于50Hz的电源上,额定转速为960r/min,(启动瞬间)转子电流的频率为( )Hz,额定运行时转子电流的频率又为( )Hz。
A.
0    20
B.
50    2
C.
0    4
D.
50    4
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