单选题The concept of NAVTEX is of a（）system for the broadcast and receipt of MSI.Asearch and rescueBsafeCco-ordinatedDhydrographic
单选题
The concept of NAVTEX is of a（）system for the broadcast and receipt of MSI.
A
search and rescue
B
safe
C
co-ordinated
D
hydrographic
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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
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