单项选择题

The grab rail of a metal lifeboat is normally located（）.

A.along the turn of the bilge
B.along each side of the keel
C.near the top of the gunwale
D.at the bow and at the stern

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单项选择题

The governor brake shall be capable of controlling the speed of lowering a fully equipped lifeboat with its complement of persons on board at（）.

A.safe speed only specified
B.not less than 120 feet per minute
C.not more than 120 feet per minute
D.not more than 90 feet per minute

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The first treatment given to a person overcome by benzene vapor should be to（）.

A.remove them to fresh air
B.flush their face with water for about 5 minutes
C.stand them up and walk them around
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单项选择题

The FIRST treatment for a surface burn is to（）.

A.wash the burned area with a warm soap and water solution
B.flood，bathe，or immerse the burned area in cold water
C.cover the burned area with talcum powder and bandag it cover the burned area with talcum powder and bandage it tightly
D.leave the burned area exposed to the atmosphere