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【多选题】
关于固定球阀和浮动球阀的描述正确的是（）。A.
浮动球阀和固定球阀都属于球阀
B.
浮动球阀的阀球可以浮动
C.
固定球阀的阀球可以浮动
D.
固定球阀一般带有浮动阀座
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A.
functional
B.
logical
C.
theoretical
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