單項(xiàng)選擇題The main function of the core of a wire rope is to（）.
A.give flexibility
B.support the strands laid around it
C.allow some circulation around the strands
D.allow lubrication inside the rope
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1.單項(xiàng)選擇題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
2.單項(xiàng)選擇題Manila slings should not be used to load（）.
A.cotton
B.lumber
C.steel
D.tires
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