()安装地点应慎重选择,必须确保工作人员能清楚地看见重物的起吊位置。
A.刹车装置
B.限制器
C.卷扬机(手摇式和电动式)
D.绞盘(绞磨)
参考答案:C, D
We didn't know you were in trouble at that time. _____, we would have given you a hand. [ ]
A. However
B. Besides
C. Otherwise
D. Anyway
什么型号的漏电产品有100/500mA动作值?