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

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单项选择题

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

单项选择题

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

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