单项选择题

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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单项选择题

Personnel boarding a davit-launched liferaft from a ship should be checked to assure they are not in possession of or wearing（）.

A.oil stained shoes or clothing
B.sharp objects that may puncture or damage the liferaft
C.matches or cigarette lighters
D.drugs or paraphernalia not approved by a medical doctor

单项选择题

On inflatable liferafts，the operating cord should be renewed by（）.

A.cutting the old line off and renewing same
B.an approved servicing facility ashore
C.opening the case and replacing the entire line
D.one of the ship's officers

单项选择题

Inflatable liferafts shall be serviced at an approved servicing facility every 12 months or not later than the next vessel inspection for certification. However，the total elapsed time between servicing cannot exceed（）.

A.12 months
B.15 months
C.17 months
D.18 months