单项选择题
From your position you observe a rotating white and green light to the north. This light is most likely（）.
A.at an airport
B.on a naval mine-countermeasures vessel
C.Block Island North Light
D.on a vessel engaged in public safety activity
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A.Nimbostratus
B.Altostratus
C.Cumulonimbus
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Freeboard is measured from the upper edge of the（）.
A.bulwark
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单项选择题
Frapping lines（）.
A.secure the lifeboat in the davits when in the stowed position
B.bring the lifeboat close alongside the rail in the embarkation position
C.give the occupants a safety line when the boat is being lowered from the embarkation level
D.reduce the swinging of the lifeboat at the embarkation level
