1) difficult mining seam
难采煤层
1.
Longwall and longhole blasting coal mining method for difficult mining seam;
难采煤层巷道长壁长孔爆破采煤方法简介
2) difficult seam mining
难采煤层开采
3) undeveloped oil-bearing reservoirs
难采储层
4) mining
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煤层开采
1.
The response character of acoustic wave velocity field of coal floor rock mass failure is discussed according to the general principle of floor failure by mining.
从煤层开采引起底板破坏一般规律出发， 探讨了底板岩体破坏与声波速度场的响应关系， 介绍了声波ＣＴ探测的原理与方法， 按采矿活动的关键阶段设计观测方案， 进行了试采面底板破坏深度的动态声波ＣＴ 探测试验。
5) Coal mining
煤层开采
1.
Effect research for leakage of surface water body in the Yuecheng Reservoir area due to coal mining;
煤层开采对岳城水库库区渗漏的影响研究
2.
Stress path analysing of soil during coal mining;
煤层开采土体应力路径分析
3.
If the coal mining of Huangling No.
依据地质勘探资料,运用水文地质学相关理论,在分析井田水文地质特征及直罗组上段隔水性能的基础上,通过导水裂隙带最大高度计算,得出了煤层开采对水源地无影响的结论,并提出了矿井建设期间应注意的事宜。
6) mining depth of coal seams
煤层采深
1.
The main geological factors which influenced top coal caving and broken characteristic contain:the strength of coal,the mining depth of coal seams,the features of coal seams with middle band,the thickness of coal seam,the fissures of coal,the roof features of coal-bed,etc.
影响顶煤垮落和破碎特性的主要地质因素有煤体强度、煤层采深、夹矸层特征、煤层厚度、煤体裂隙、煤层顶板特征等。
补充资料：难夫难妻(难ｎàｎ)
一名《洞房花烛》。故事片。亚细亚影戏公司1913年摄制。郑正秋编剧，张石川、郑正秋导演。一对素不相识的青年男女，经媒婆撮合拜堂成亲，在封建礼教桎梏下开始艰难的夫妻生活。为中国第一部故事片。
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参考词条