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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 > 船舶及其结构 > 船舶结构基本知识

单项选择题

Upon underwater（）by divers，there are no apparent（）on the bottom plates of the said vessel.

A.detection，defects
B.defection，defects
C.defects，defection
D.defects，detection

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