问题
单项选择题
The urgency signal concerning the illness of persons on board ship is（）.
A.Mayday
B.Pan
C.Securite
D.Attention
答案
参考答案：B
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The urgency signal concerning the illness of persons on board ship is（）.
A.Mayday
B.Pan
C.Securite
D.Attention
参考答案：B