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关注:1
2013-05-23 12:21
求翻译:Underground coal mining in South Africa accounts for 51%,long wall mining and room-and-pillar mining are main methods.是什么意思? 待解决
悬赏分:1
- 离问题结束还有
Underground coal mining in South Africa accounts for 51%,long wall mining and room-and-pillar mining are main methods.
问题补充: |
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