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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

A Coast Guard radiotelephone message about an aid to navigation that is off station is preceded by the word（）.

A.PAN-PAN
B.MAYDAY
C.SOS
D.SECURITY

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A radiotelegraph message commencing with XXX has the same meaning as a message sent by the radiotelephone commencing with（）.

A.TTT
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Messages concerning weather conditions transmitted by radiotelephone are preceded by（）.

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