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
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（）.
单项选择题 How are riveted lap joints made watertight（）.
