单项选择题
It is more economical to use （）, because of their greater strength and longer useful lives.正确答案A
A. nylon ropes
B. manila ropes
C. sisal ropes
D. wooden ropes
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相关考题
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单项选择题
Natural fiber rope is made （）the fibers of different plants.
A.up
B.from
C.of
D.with -
单项选择题
Wire rope needs （）care than hemp and manila.
A.good
B.well
C.better
D.best -
单项选择题
（）is the strongest and the most elastic of all the synthetic fiber ropes.
A. Hemp rope
B. Wire rope
C. Nylon rope
D. wood rope
