单项选择题
A message giving warning of a hurricane should have which prefix when sent by radiotelephone?（）
A.Pan-Pan (3 times)
B.Securite Securite Securite
C.TTT TTT TTT
D.No special prefix
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相关考题
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单项选择题
A Coast Guard radiotelephone message about an aid to navigation that is off station is preceded by the word（）.
A.PAN-PAN
B.MAYDAY
C.SOS
D.SECURITY -
单项选择题
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 -
单项选择题
Messages concerning weather conditions transmitted by radiotelephone are preceded by（）.
A.MAYDAY
B.PAN-PAN
C.SECURITE
D.SOS
