挂篮施工应经常检查（ ）等是否完好可靠。

four choices marked A, B, C, and D. Read them and choose the best answer. Then write your answer on the Answer Sheet. He was born in theA．the 1980sB．1980sC．1988sD．the 1988

A.油表振动剧烈
B.漏油
C.电机声音异常
D.发生断丝、滑丝
E.油表指针抖动