A.hauling in on the anchor line as you would any anchor……

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

单项选择题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

单项选择题According（）the report，the ship hit the wharf when berthing.

A.of
B.to
C.for
D.on

单项选择题A vessel showing a yellow light over a white light at night is a vessel（）.

A.engaged in piloting
B.towing astern
C.engaged in fishing
D.in distress