A.international NAVTEX ServiceB.FleetNET ServiceC.Safet……

单项选择题All NAVTEX messages（）owing to their nature of importance.

A.can suppress
B.can be suppressed
C.can not be suppressed
D.are to be suppressed

单项选择题The difference between international and national Navtex Service is limited to（）.

A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time

单项选择题A Navtex station in each NAVAREA is usually allowed to have（）for transmission.

A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours

单项选择题The NAVTEX receiver can be mounted on（）.

A.on the bridge
B.in the coast station
C.on the forecastle
D.on starboard side

单项选择题The concept of NAVTEX is of a（）system for the broadcast and receipt of MSI.

A.search and rescue
B.safe
C.co-ordinated
D.hydrographic