将设置自动喷水灭火系统的场所划分为4个等级，即轻危险级、（）、严重危险级、仓库危险级。
参考答案：中危险级
— You look so happy. What happened?
— I have got an "A" in ____ P.E. test. [ ]
A. your
B. her
C. his
D. my
沉井用水枪冲土下沉，施工设备不包括()。
A.高压水泵
B.吸泥器
C.供水管路
D.多瓣抓
