多项选择题
A.滑丝故障B.退化型故障C.松脱型故障D.失调型故障E.堵塞与渗漏型故障
A.晚期故障期B.中期故障期C.偶发故障期D.损耗故障期E.后期故障期
A.电机烧毁B.高处坠落C.物体打击D.触电E.钢丝绳磨损