多项选择题
压力管道阀门的种类较多，按其作用分，有截止阀（）等。
A.调节阀B.止逆阀C.减压阀D.稳压阀和转向阀
单项选择题 We had a so long and（）political meeting that we felt（）.
单项选择题 It’s no use arguing with him and so we left him（）in the front room.
单项选择题 During the inspection I said something that I now wish I could（）.
