单项选择题
The receiving stations can use the B2 character to（）different, classes of messages.
A.identify
B.Correct
C.Reject
D.Print out
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相关考题
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单项选择题
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 -
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 -
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
