单项选择题
A distress signal（）.
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
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相关考题
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单项选择题
TO EVACUATE A VESSEL FROM CREW AND PASSENGERS FOLLOWING A DISTRESS means（）.
A.Abandon vessel
B.Adrift
C.Beach to
D.Assembly station -
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
