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关注：1
2013-05-23 12:21
求翻译：但局部存在的极破碎顶板，一经开采即发生垮落是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
但局部存在的极破碎顶板，一经开采即发生垮落
问题补充： |
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2013-05-23 12:21:38
However, the local existence of a very broken roof, once mining occurred Roof falling
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2013-05-23 12:23:18
But local presence in a very fragmented top plates, i.e. top plates down the exploitation Lok
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2013-05-23 12:24:58
But partial existence side stave roof, as soon as passes through mining namely to have the roof to break down falls
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2013-05-23 12:26:38
But local existence of broken roof, once mining roof caving
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2013-05-23 12:28:18
google学术
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