A.5% B.10% C.15% D.1%
A.電動機停轉(zhuǎn) B.電動機溫度過高而冒煙 C.轉(zhuǎn)速變慢 D.電動機外殼帶電
A.缺相 B.電壓偏高 C.負(fù)載不穩(wěn)定 D.大氣過電壓