A.加快 B.變慢 C.為零 D.不變
A.5% B.10% C.15% D.1%
A.電動機(jī)停轉(zhuǎn) B.電動機(jī)溫度過高而冒煙 C.轉(zhuǎn)速變慢 D.電動機(jī)外殼帶電