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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相关考题
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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
It is possible for ships to receive safety message transmitted by Navtex station（）.
A.in any INMARSAT regions
B.in each NAVTEX area
C.at any distance
D.in Areas A3 and A4 -
单项选择题
The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.
A.navigational / typhoon
B.traffic / meteorological
C.marine / hurricane
D.navigational / meteorological
