单选题You can indicate that your vessel is in distress by（）.Adisplaying a large red flagBdisplaying three black balls in a vertical lineCsounding four or more short rapid blasts on the whistleDcontinuously sounding the fog whistle
单选题
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
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