VHF Channel 6 is used exclusively for what kind of communications?（）<br>A:Radio checks and time checks<br>B:Inter-vessel safety and search and rescue<br>C:Working with helicopters<br>D:Radio direction finding

VHF Channel 6 is used exclusively for what kind of communications?（）
A:Radio checks and time checks
B:Inter-vessel safety and search and rescue
C:Working with helicopters
D:Radio direction finding

出自：海船船员证

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