连接锅炉和蒸汽母管的蒸汽管道上，安装疏水阀是为了（）。
A、排出空气
B、排出赃物
C、防止发生水击现象
D、排出蒸汽
参考答案：C
Having retired, he ________ the club for old men and played chess every day there.[ ]
A．joined
B．took part
C．attended
D．participated
临床常用的智力测验的方法是
A．明尼苏答测验(MMP
B．症状核查量表(SCL-90)
C．艾森克测验(EP
D．韦氏测验(WAI
E．卡特尔测验(16P
