单选题A Navtex station in each NAVAREA is usually allowed to have（）for transmission.A10 minutes every 4 hoursBhalf an hour every other hourCirregular period of timeD5 minutes every two hours
单选题
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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