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

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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

单项选择题

A.special
B.different
C.expensive
D.valuable