What is NOT a distress signal?（）<br>A:A continuous sounding of the fog horn<br>B:Firing a gun every minute<br>C:Five or more short rapid blasts on the whistle<br>D:A square flag and ball flown from the mast

What is NOT a distress signal?（）
A:A continuous sounding of the fog horn
B:Firing a gun every minute
C:Five or more short rapid blasts on the whistle
D:A square flag and ball flown from the mast

出自：海船船员证

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