It is more economical to use （）, because of their greater strength and longer useful lives.正确答案A<br>A:nylon ropes<br>B:manila ropes<br>C:sisal ropes<br>D:wooden ropes

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

出自：船舶水手证

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