“开放型”学院风气
参考答案:
以下关于水箱增压系统说法正确的是()。
A.系统增压饮用水箱及废水箱
B.增压系统只能用气源系统引气作为气源
C.气源系统来的引气经压力调节器调节后进入水箱
D.空气压缩机进口气滤必须与压缩机一起更换
— Turn off the TV, Jack, _____ your homework now?
— Mum, just ten more minutes, please. [ ]
A. Should you be doing
B. Shouldn't you be doing
C. Couldn't you be doing
D. Will you be doing