1.
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
2.
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
3.
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
4.
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
5.
Application of Fully Mechanized Mining Technology with Caving of Roof Coal in "Three Soft" Large Clined Angle Thick Coal Seam Mining
综采放顶煤技术在“三软”大倾角厚煤层开采中的应用
6.
A research on highly efficient mining technology for use in extra long top coal caving logwall faces with big mining heights in soft,thick and gassy coal seams
高瓦斯松软厚煤层大采高超长综放工作面高产高效技术研究
7.
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
8.
"Three soft" in thick Coal Comprehensive mechanization mining stent selection of importance
“三软”中厚煤层综采支架选型的重要性
9.
Research on Equipments Coordination for Shearer in Soft Coal Thin Seam with Hard Roof
硬顶软煤薄煤层滚筒采煤机设备配套研究
10.
Deep-hole construction technology of gas drainage for single low-pervious and mellow thick coal seams with water
单一低透松软含水厚煤层瓦斯抽放深孔施工技术
11.
This means that they have a soft, downy undercoat and a harder guard coat.
也就是说他们除了一层柔软的底层毛以外，还有一层比较厚硬的外层毛。
12.
either of two large northern marine mammals having ivory tusks and tough hide over thick blubber.
两种大型北方哺乳动物之一，有尖牙，厚厚的鲸脂外面有粗糙的硬皮。
13.
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
14.
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
15.
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
16.
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
17.
Study on the Roof Bedding Separation and Anchoring Effect of Extremely Thick Coal Seam Large Section Roadway;
特厚煤层大断面煤巷顶板离层及锚固效应研究
18.
From out the front windows one could see a deep, soft bedding.
从前窗向外看得见一层厚厚的、软软的雪。