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單項(xiàng)選擇題

Distress signals may be（）.

A.red flares
B.smoke signals
C.sound signals
D.Any of the above

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單項(xiàng)選擇題

By regulation，orange smoke distress signals will expire not more than how many months from the date of manufacture?（）

A.24 months
B.36 months
C.42 months
D.54 months

單項(xiàng)選擇題

At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is（）.

A.in distress
B.approaching a bend in the channel
C.operating astern propulsion
D.intending to overtake another vessel

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