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You are underway in fog and you hear one prolonged...
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You are underway in fog and you hear one prolonged blast followed by two short blasts.This is a vessel（）.

发布日期：2021-03-22

A.Towing

B.Engaged on pilotage duty

C.Aground in a fairway

D.Stopped and making no way through the water

标签： underway fog hear prolonged blast
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