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关注：1
2013-05-23 12:21
求翻译：Of all metals .only copper and iron were widely used in industry at the beginning of this century .是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
Of all metals .only copper and iron were widely used in industry at the beginning of this century .
问题补充： |
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