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【单选题】
异步电动机工作于电动状态时,转子绕组中的电流是____。
A.
直流
B.
低于定子电流频率的交流
C.
高于定子电流频率的交流
D.
等于定子电流频率的交流
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【单选题】对一台不经常起动且起动时间不长的电动机的短路保护,熔体的额定电流/RN应大于或 等于( )倍电动机额定电流“。
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