What is NOT a distress signal?（）<br>A:Red flares or red rockets<br>B:Continuous sounding of fog signaling apparatus<br>C:International Code Flags "November" and "Charlie"<br>D:Basket hanging in the rigging

What is NOT a distress signal?（）
A:Red flares or red rockets
B:Continuous sounding of fog signaling apparatus
C:International Code Flags "November" and "Charlie"
D:Basket hanging in the rigging

出自：海船船员证

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