单项选择题
A mechanical davit is designed to automatically（）.
A.position the boat at the embarkation station
B.lift the boat off the inboard chocks
C.energize the winch for the falls
D.set the brake on the winch
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A helicopter making a round trip from a helideck with refueling capabilities to an unmanned platform will take 45 minutes each way. The helicopter should be carrying enough fuel to last（）.
A.45 minutes
B.1 hour and 15 minutes
C.1 hour and 30 minutes
D.2 hours -
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A floating ship with an initial negative metacentric height（）.
A.will capsize
B.will incline further
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A capsized small sail vessel is best righted when what part of the vessel is downwind?（）
A.Stern
B.Bow
C.Centerboard
D.Mast
