问题
单项选择题
The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word().
A.Mayday
B.Pan
C.Safety
D.Interco
答案
参考答案:B
The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word().
A.Mayday
B.Pan
C.Safety
D.Interco
参考答案:B