1.
Study on Technology of Hard and Thick Top-coal Weakening in Fully Mechanized Caving Faces in Binchang Mining District;
彬长坚硬厚煤层综放开采顶煤弱化技术研究
2.
Research on Mining Method in Shallow and Adamancy Coal Seam of Xiegou Coal Mine in Xingxian Area
兴县矿区斜沟煤矿浅埋深坚硬厚煤层开采方法研究
3.
Rock pressure of high angle thick coal seam by numerical calculation
大倾角坚硬顶板厚煤层矿压规律数值计算
4.
Strata Behavior Features of Fully Mechanized Top Coal Caving Mining Face in Ultra Thick Seam with Hard Roof in Binchang Mining Area
彬长矿区坚硬特厚煤层综放面矿压显现特征
5.
Research on the Top Coal Caving and Drawing Characteristics of Caving Roof Coal Mining for Shallawly Buries and Hard-Thick Coal Seam;
浅埋藏坚硬特厚煤层放顶煤开采顶煤冒放性研究
6.
Study on the Reasonable Retainning of the Waterproof Coal Pillar of Steep Medium & Thick Coal Seam with Hard Roof;
急倾斜坚硬顶板中厚煤层防水煤柱合理留设研究
7.
Study and Application on Stability of Hard and Massive Overlying Strata in Fully Mechanized Sublevel Caving Face;
综采放顶煤采场厚层坚硬顶板稳定性分析及应用
8.
Plowability of plow mining on thin and soft coal seam with hard roof
坚硬顶板松软薄煤层刨煤机开采可刨性研究
9.
Technology and Control of First Roof Caving at Fully Mechanized Coal Face with Hard and Massive Overlying Strata
厚层坚硬顶板综采工作面初次放顶技术管理
10.
Probing into Mine Fire Prevention and Control Technology in Special Thick Coal Seam with Hard Rock and Hard Coal in Datong;
“两硬”条件特厚煤层综放开采防灭火技术探讨
11.
Research on Improving mining Rate in Fully Mechanized Top Coal Caving Face with Shallow Hard Thick Coal Seams and Its Practice
浅埋硬厚煤层提高综放采出率的研究与实践
12.
evergreen aromatic shrubby tree of southeastern United States having small hard berries thickly coated with white wax used for candles.
美国东南的常青芳香灌木树种，有小的硬的厚厚涂层的坚果。
13.
Solution of High Gas Harder Coal Mining by Deep High-pressure Water
利用深孔高压注水解决高瓦斯较坚硬煤层开采
14.
Study on Key Technologies of Reasonable Mining in the Condition of Soft Coal, Thick-hard Roof and Contiguous Seams;
软煤、厚硬顶板、极近距离煤层合理开采关键技术研究
15.
Analogue Simulation Research on Roof Moving Rule of Two Soft and One Hard and Largely Inequality Depth Coal Seam in Yunmei No.1 Coal Mine
云煤一矿两软一硬大厚差煤层顶板活动规律研究
16.
Having a thick, heavy, or hardened shell.
具有厚重或坚硬的壳的
17.
Hard roof prone to bump coal seam:regularity of electro-magnetic radiation,its prediction and application
坚硬顶板易冲击煤层电磁辐射规律及其预测应用
18.
The ice is hard enough to skate on.
冰层已够坚厚，可以滑冰。