單項選擇題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


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1.單項選擇題Manila slings should not be used to load().

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

2.單項選擇題Instead of whipping an end of a line,a temporary means of preventing the line from unraveling is to tie a().

A.becket bend
B.blackwall hitch
C.figure-eight knot
D.square knot

4.單項選擇題If kinking results while wire rope is being coiled clockwise,you should().

A.coil it counterclockwise
B.not coil it
C.take a turn under
D.twist out the kinks under a strain

5.單項選擇題How is the size of chain determined().

A.Length of link in inches
B.Diameter of metal in link in inches or centimeters
C.Links per fathom
D.Weight of stud cable in pounds