A Navtex station in each NAVAREA is usually allowed to have（）for transmission.<br>A:10 minutes every 4 hours<br>B:half an hour every other hour<br>C:irregular period of time<br>D:5 minutes every two hours

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

出自：海船船员证

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