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