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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 > 船舶操纵 > 狭水道、冰区与运河航行

单项选择题

A strong back refers to a（）.

A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay

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A stretch where the channel changes from one side of theriver to the other is called a（）.

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