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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(驾驶专业) > 航海英语 > 海上应急用语 > 紧急用语

单项选择题

Which of the following indicates a grave and imminent danger requesting immediate assistance on radio telephone?（）.

A.SOS
B.Mayday
C.Securite
D.PAN

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