A radiotelegraph message commencing with XXX has the same meaning as a message sent by the radiotelephone commencing with（）.<br>A:TTT<br>B:SOS<br>C:The spoken word URGENCY<br>D:The spoken word PAN

A radiotelegraph message commencing with XXX has the same meaning as a message sent by the radiotelephone commencing with（）.
A:TTT
B:SOS
C:The spoken word URGENCY
D:The spoken word PAN

出自：海船船员证

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