What would NOT be a distress signal?（）.<br>A:MAYDAY sent by radiotelephone<br>B:Continuous sounding of fog horn<br>C:Green star shells fired from a launcher<br>D:Square flag and ball in a vertical line

What would NOT be a distress signal?（）.
A:MAYDAY sent by radiotelephone
B:Continuous sounding of fog horn
C:Green star shells fired from a launcher
D:Square flag and ball in a vertical line

出自：海船船员证

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