单项选择题

Manila slings should not be used to load（）.

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

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单项选择题

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

单项选择题

If you were to pass a stopper on a wire rope，what should the stopper be made of（）.

A.Wire
B.Manila
C.Nylon
D.Chain

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