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單項選擇題

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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單項選擇題

Messages concerning weather conditions transmitted by radiotelephone are preceded by（）.

A.MAYDAY
B.PAN-PAN
C.SECURITE
D.SOS

單項選擇題

The radiotelephone message that indicates a station is about to transmit a message concerning the safety of navigation or important meteorological warnings commences with（）.

A.TTT
B.The spoken word PAN
C.The spoken word SECURITE
D.XXX