单选题A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.Acheck valveBnon-return valveCsteam trapDquick closing trap
单选题
A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.
A
check valve
B
non-return valve
C
steam trap
D
quick closing trap
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