单选题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.A518B2182C156.8D2187.5

单选题
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


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