单选题The radiotelephone message that indicates a station is about to transmit a message concerning the safety of navigation or important meteorological warnings commences with（）.ATTTBThe spoken word PANCThe spoken word SECURITEDXXX
单选题
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
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