单项选择题
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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相关考题
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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 -
单项选择题
Manila slings should not be used to load（）.
A.cotton
B.lumber
C.steel
D.tires -
单项选择题
Manila lines in which the strands are right-hand laid（）.
A.should be coiled in a clockwise direction
B.should be coiled in a counterclockwise direction
C.may be coiled either clockwise or counterclockwise
D.should never be coiled
