A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.<br>A:check valve<br>B:non-return valve<br>C:steam trap<br>D:quick closing trap

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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