单项选择题

Prior to lowering the lifeboat，the most important item to check is the（）.

A.oars
B.sail
C.boat plug
D.life preservers

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单项选择题

On open lifeboats，the purpose of the wire stretched between the davit heads is to（）.

A.keep the movement of the davits at the same speed
B.keep the davits from slipping when they are in the stowed position
C.prevent vibration during lowering of the boat
D.support the manropes

单项选择题

On a passenger vessel，the vessel’s name must appear on（）.

A.ring life buoy
B.lifeboats
C.lifeboat oars
D.All of the above

单项选择题

Most lifeboats are equipped with（）.

A.unbalanced rudders
B.balanced rudders
C.contraguide rudders
D.straight rudders