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單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

The frequency 518KHZ will be used to transmit（）and（）wanings in NAVTEX.

A.navigational / typhoon
B.traffic / meteorological
C.marine / hurricane
D.navigational / meteorological