In radiotelephone communications，the prefix PAN-PAN indicates that（）.<br>A:a ship is threatened by grave and imminent danger and requests immediate assistance<br>B:a calling station has an urgent message about the safety of a person<br>C:the message following the prefix will be about the safety of navigation<br>D:the message following is a meteorological warning

In radiotelephone communications，the prefix PAN-PAN indicates that（）.
A:a ship is threatened by grave and imminent danger and requests immediate assistance
B:a calling station has an urgent message about the safety of a person
C:the message following the prefix will be about the safety of navigation
D:the message following is a meteorological warning

出自：海船船员证

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