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單項(xiàng)選擇題

Navtex transmitter identification character（）is used to identify the broadcasts which are to be accepted by the receiver and those are to be rejected.

A.B2
B.B1
C.MAR
D.NNN

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單項(xiàng)選擇題

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

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