The valve that prevents water from backing out of the boiler into the feed line is the（）.<br>A:bottom-blow valve<br>B:skin valve<br>C:feed-check valve<br>D:feed-stop valve

The valve that prevents water from backing out of the boiler into the feed line is the（）.
A:bottom-blow valve
B:skin valve
C:feed-check valve
D:feed-stop valve

出自：海船船员证

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