提升装置必须有声光兼备的信号装置。
参考答案：对
I passed by the sports field the other day,______ there was a football match going on then. [ ]
A. that
B. where
C. which
D. when
临时接地线的拆卸，应（）
A.先拆导体端，后拆接地端
B.不分先后
C.先拆接地端，后拆导体端
