多项选择题
生活给水管道内的水流速度不宜大于( )m/s。A.1.0B.1.5C.1.8D.2.5
单项选择题生活给水管道内的水流速度不宜大于( )m/s。
I never seem to have any time_________with my parents.A...
单项选择题I never seem to have any time_________with my parents.
The girl is waiting for her aunt on_________side of the...
单项选择题The girl is waiting for her aunt on_________side of the road.
