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
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相关考题
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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 -
单项选择题
Most covered lifeboats will right themselves after capsizing if the（）.
A.passengers are strapped to their seats
B.fuel tanks are not less than half full
C.sea anchor is deployed to windward
D.lower ballast tanks are filled with water
