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关注：1
2013-05-23 12:21
求翻译：Although carbon fiber can be from pitch precursor, the processing and purifying it to the fiber form is very expensive and generally, they are more expensive than PAN-based fibers是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
Although carbon fiber can be from pitch precursor, the processing and purifying it to the fiber form is very expensive and generally, they are more expensive than PAN-based fibers
问题补充： |
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