大家在查： Tognaccini 惠慧蒂里翁 discussion among pontocerebellum 肝组织 Sangatsu Scafell Culturelle？forKids 罗塞尔·霍克希尔德

层煤

层煤

层煤

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There's a thin layer of coal between the two layers of rock .

在这两层岩石之间有一薄层煤。

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Releasing pillar of alluvial deposit by using overhead fully mechanized mining technique

利用高架综采技术解放冲积层煤柱

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Analysis on coal structure and gas parameters of main mining seam in Haizi Mine

海孜煤矿主采煤层煤体结构及瓦斯参数特征分析

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Research on second layer coal compound roof treatment

二层煤复合顶板的治理方法研究

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The safe construction under the alluvium coal column of "Three Soft " coal seam

“三软 ”煤层冲积层煤柱下安全施工

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Design about a new type of grate for fixed bed gasifier

浅谈固定层煤造气炉新型宝塔炉箅的设计

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Analysis and treatment of gas abnormal bursting in No. 11 layer Huayuan mine

华源矿业 11 层煤瓦斯异常涌出的分析与治理

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Practice on mining of alluvium coal pillar

冲积层煤柱的开采与实践

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Optimizing Design System of Explosion Parameters in No. 2 Coal Layer in Panzhuang Coal Mine

庞庄煤矿 2 层煤爆破参数的优化

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