單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題According（）the report，the ship hit the wharf when berthing.

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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題A message warning of a tropical storm should be sent as a(n)（）.

A.routine message
B.urgent message
C.distress message
D.safety message