单项选择题

The satellites over the major ocean regions cover the globe（）.

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°

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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

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

单项选择题

NAVTEX transmissions have a designed range of about（）nautical miles.

A.300
B.400
C.500
D.600