单项选择题
A.besides the polar regions B.including the North Pole and the South Pole C.above 70°N and below 70°S D.as for north and south as 70°
In NAVTEX service, VITAL warnings will（）by transmitting...
单项选择题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
In NAVTEX service, the subject indicate character B mea...
单项选择题In NAVTEX service, the subject indicate character B means（）.
A.meteorological warnings B.navigational warnings C.search and rescue information D.meteorological forecast
NAVTEX transmissions have a designed range of about（）na...
单项选择题NAVTEX transmissions have a designed range of about（）nautical miles.
A.300 B.400 C.500 D.600
