The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.<br>A:SOS<br>B:XXX<br>C:TTT<br>D:PAN

The Urgency Signal（）indicates that the station calling has a very urgent message to transmit concerning the safety of a ship or aircraft，or of some person on board or within sight.
A:SOS
B:XXX
C:TTT
D:PAN

出自：海船船员证

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