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

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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

单项选择题

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