单项选择题

A.Survey vesselB.Vessel not under commandC.Vessel agrou……

You see a vessel displaying three lights in a vertical line.The highest and lowest lights are red and the middle light is white.She is also showing a white light at the stern，which is lower than the forward light.It could be a（）.

A.Survey vessel
B.Vessel not under command
C.Vessel aground
D.Pilot vessel with port side to you

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单项选择题You see a vessel carrying a black diamond which indicates a（）.

A.vessel towing astern
B.barge pushed ahead
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单项选择题You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.

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D.alter course to port to pass the other vessel on its portside

单项选择题You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.

A.one blast，4 to 6 seconds in duration
B.three blasts，4 to 6 seconds in duration
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D.one blast，8 to 10 seconds in duration

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B.You must maneuver to avoid the tug and tow
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