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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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