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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 > 船舶修理与保养 > 船舶索具及保养

单项选择题

Neglecting friction，you desire to lift a 300 kgs weight with a stress on the hauling part of 100 kgs.Which of the following tackles would you use（）.

A.Gun tackle
B.Luff tackle
C.Two-fold tackle
D.Double-luff tackle

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