单项选择题
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
C.vessel towing astern only when the length of her tow exceeds 200 meters
D.this signal does not exist in international waters -
单项选择题
You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.
A.Reduce speed to bare steerageway
B.Stop your engines
C.Begin a radar plot
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单项选择题
You are underway in reduced visibility.You hear the fog signal of another vessel about 20° on your starboard bow.Risk of collision may exist.You should（）.
A.alter course to starboard to pass around the other vessel
B.reduce your speed to bare steerageway
C.slow your engines and let the other vessel pass ahead of you
D.alter course to port to pass the other vessel on its portside
