You can indicate that your vessel is in distress by（）.<br>A:displaying a large red flag<br>B:displaying three black balls in a vertical line<br>C:sounding four or more short rapid blasts on the whistle<br>D:continuously sounding the fog whistle

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

出自：海船船员证

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