【单选题】【消耗次数：1】
三相异步电动机的转向取决于（ ）。
①
初始转向
②
电源相序
③
电源电压
④
电动机本身
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三相异步电动机能耗制动的方法就是在切断三相电源的同时（ ）。
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给转子绕组中通入交流电
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