在下列那些部位进行高处作业必须设置防护栏杆?()
A.基坑周边
B.雨蓬边
C.挑檐边
D.无外脚手的屋面与楼层周边
E.料台与挑平台周边
参考答案:A, B, C, D, E
The doctors said that there was ___ wrong with Jane’s legs, but they could do ___ to help her.
A.something, nothing
B.anything, something
C.nothing, everything
D.everything, something
A.等于50 mL
B.大于50 mL
C.等于100 mL
D.大于100 mL