单选题It is more economical to use （）, because of their greater strength and longer useful lives.正确答案AAnylon ropesBmanila ropesCsisal ropesDwooden ropes
单选题
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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