单项选择题
Deficient oxygen content inside a chain locker can be detected with（）.
A.litmus paper
B.a combustible gas indicator
C.an oxygen breathing apparatus
D.an oxygen indicator
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Continuous sounding of a fog whistle by a vessel is a signal（）.
A.that the vessel is anchored
B.to request the draw span of a bridge to be opened
C.of distress
D.that the vessel is broken down and drifting -
单项选择题
Before entering the chain locker，you should（）.
A.have someone standing by
B.make sure there is sufficient air within the locker
C.de-energize the windlass
D.All of the above -
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According（）the report，the ship hit the wharf when berthing.
A.of
B.to
C.for
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