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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 > 海上通信 > GMDSS

单项选择题

Exchange of answerbacks act s a confirmation that the messages（）at the destination.

A.have received
B.have been received
C.are received
D.are being received

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The distance between the two NAVTEX stations with the same B1 character should be not exceed（）nautical miles.

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单项选择题
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