單項(xiàng)選擇題
A.consists of 5 or more short blasts of the fog signal apparatus B.consists of the raising and lowering of a large white flag C.may be used separately or with other distress signals D.is used to indicate doubt about another vessel's intentions
A.Abandon vessel B.Adrift C.Beach to D.Assembly station
A.displaying a large red flag B.displaying three black balls in a vertical line C.sounding four or more short rapid blasts on the whistle D.continuously sounding the fog whistle
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