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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2.單項(xiàng)選擇題Manila slings should not be used to load().

A.cotton
B.lumber
C.steel
D.tires