单项选择题
A. in wet places B. close to the heat C. away from chemicals D. in dry places
It is more economical to use （）, because of their great...
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
Natural fiber rope is made （）the fibers of different pl...
单项选择题Natural fiber rope is made （）the fibers of different plants.
A.up B.from C.of D.with
Wire rope needs （）care than hemp and manila.A.goodB.wel...
单项选择题Wire rope needs （）care than hemp and manila.
A.good B.well C.better D.best
