单选题International distress signal in VHF calling for help is（）.AHelp，Help，HelpBMayday，Mayday，MaydayCSave，Save，SaveDRescue，Rescue，Rescue
单选题
International distress signal in VHF calling for help is（）.
A
Help，Help，Help
B
Mayday，Mayday，Mayday
C
Save，Save，Save
D
Rescue，Rescue，Rescue
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