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关注：1
2013-05-23 12:21
求翻译：The extraction of copper can be performed in the presence of iron, but the extraction of zinc requires removal of the iron, and the pre-preparation of the solution to remove iron is costly and complicated, mainly because iron occurs in both its valences.是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
The extraction of copper can be performed in the presence of iron, but the extraction of zinc requires removal of the iron, and the pre-preparation of the solution to remove iron is costly and complicated, mainly because iron occurs in both its valences.
问题补充： |
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2013-05-23 12:21:38
能在铁存在萃取铜，但萃取锌的要求拆除了铁，溶液来除去钢铁是昂贵的，复杂，主要是因为中铁两价态前期准备。
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2013-05-23 12:23:18
正在翻译，请等待...
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2013-05-23 12:24:58
正在翻译，请等待...
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2013-05-23 12:26:38
提取的铜铁，在场的情况下可以执行，但提取锌的要求除铁，和删除铁溶液的 pre-preparation 主要是成本高昂，而且复杂，因为铁发生在其两个价。
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2013-05-23 12:28:18
提取的铜铁，在场的情况下可以执行，但提取锌的要求除铁，和删除铁溶液的 pre-preparation 主要是成本高昂，而且复杂，因为铁发生在其两个价。
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