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【单选题】
如图为电动机的控制线路图,若KM 3 触点因故不能闭合,其他线路正常,则合QS三相电源开关并启动电动机后,­­­______。
A.
电动机先是降压启动，时间后，停转
B.
电动机先是降压启动，但不能成功的换接成△
C.
主电路熔断器熔断
D.
按下启动按钮，电动机不转
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