问题
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
答案
参考答案：D
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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
参考答案：D