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
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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