问题
单项选择题
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
答案
参考答案:B
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
参考答案:B