International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.<br>A:518<br>B:2182<br>C:156.8<br>D:2187.5

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
A:518
B:2182
C:156.8
D:2187.5

出自：海船船员证

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