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
正确答案:A
答案解析:有
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船舶水手考试
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It is more economical to use （）, because of their greater strength and longer useful lives.正确答案A
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