单项选择题
A.swaged socket B.thimbled mechanical splice C.hand splice D.spelter poured and resin sockets
The main function of the core of a wire rope is to（）.A....
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
Neglecting friction，you desire to lift a 300 kgs weight...
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
Manila slings should not be used to load（）.A.cottonB.lu...
单项选择题Manila slings should not be used to load（）.
A.cotton B.lumber C.steel D.tires
