问题
单项选择题
If you wished to transmit a message by voice concerning the safety of navigation，you would preface it by the word（）.
A.Mayday
B.Pan-pan
C.Securite
D.Safety
答案
参考答案：C
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If you wished to transmit a message by voice concerning the safety of navigation，you would preface it by the word（）.
A.Mayday
B.Pan-pan
C.Securite
D.Safety
参考答案：C