The difference between international and national Navtex Service is limited to（）.<br>A:frequency allocated<br>B:both language and frequency<br>C:language used<br>D:transmission power and time

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

出自：海船船员证

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