单选题In NAVTEX service, VITAL warnings will（）by transmitting station.Abe transmitted at once though the frequency is not clearBbe transmitted as soon as the frequency is cleared coordinatelyCbe transmitted at its scheduled transmissionsDbe transmitted at next scheduled transmissions
单选题
In NAVTEX service, VITAL warnings will（）by transmitting station.
A
be transmitted at once though the frequency is not clear
B
be transmitted as soon as the frequency is cleared coordinately
C
be transmitted at its scheduled transmissions
D
be transmitted at next scheduled transmissions
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