Prior to boarding from a vessel，a davit-launched liferaft should be well ventilated of excess（）.<br>A:hydrocarbon gas<br>B:carbon monoxide gas<br>C:carbon dioxide gas<br>D:freon gas

Prior to boarding from a vessel，a davit-launched liferaft should be well ventilated of excess（）.
A:hydrocarbon gas
B:carbon monoxide gas
C:carbon dioxide gas
D:freon gas

出自：海船船员证

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