多项选择题
管道组成件是用于连接或装配管道的元件，包括（）、疏水器、过滤器和分离器等。
A.管子、管件
B.法兰、垫片
C.阀门以及膨胀接头
D.挠性接头
E.弹簧支吊架
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扩展信用卡发行范围,开拓企业信用卡业务等积极争取市场份额的行为,会给商业银行带来很大的机遇,同时也带来了更多的不确定因素。( )
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公称直径为600mm的液体管道在压力试验合格后应进行吹洗工作，正确的做法是（）。
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B.蒸汽吹扫
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