单项选择题
A.Abandon vessel B.Adrift C.Beach to D.Assembly station
You can indicate that your vessel is in distress by（）.A...
单项选择题You can indicate that your vessel is in distress by（）.
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
