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（）.
单项选择题 If kinking results while wire rope is being coiled clockwise，you should（）.
单项选择题 How is the size of chain determined（）.
