载荷制动器在吊额定载荷时制动，载荷下滑量超过额定起升速度的（）时，应进行检修。
A.1/100
B.1/80
C.1/50
参考答案：A
什么是水泵接合器？分为哪几类？
The room isn't ______ for three people . [ ]
A. enough big
B. big enough
C. enough room
D. enough place
