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单选题
You are underway in fog and you hear one prolonged blast followed by two short blasts.This is a vessel（）.
A
Towing
B
Engaged on pilotage duty
C
Aground in a fairway
D
Stopped and making no way through the water
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考题
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考题
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考题
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考题
单选题A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.A
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考题
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A rapid ringing of a bell for 5 seconds，preceded and followed by three separate and distinct strokes on the bell
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