单选题Prior to boarding from a vessel，a davit-launched liferaft should be well ventilated of excess（）.Ahydrocarbon gasBcarbon monoxide gasCcarbon dioxide gasDfreon gas
单选题
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
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