1.
Technology Application Study on Hydraulic Pressing in Coal Face of Medium Hard Seam
中硬煤层采煤工作面水力压挤技术应用研究
2.
lignite - tar pitch
褐煤柏油脂, 褐煤硬沥青
3.
a hard wax obtained from lignite.
取自褐煤的一种硬蜡。
4.
coal is a hard black material; wheat is the stuff they use to make bread.
煤是一种硬的黑色原料。
5.
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
6.
Compression and hardening over long periods of time, the processes by which coal is formed from plant materials.
煤化作用经过长期压缩和硬化，植物成煤的过程
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.
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.
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
10.
a hard natural coal that burns slowly and gives intense heat.
一种硬质的天然煤，燃烧缓慢，热度强。
11.
Cemented carbide for coal-mining tools
GB/T14445-1993煤炭采掘工具用硬质合金制品
12.
Rapid Construction Technology for Auxiliary Shaft in Super-thick Hard Rock in Babao Mine
八宝煤矿副井超厚硬岩快速施工技术
13.
Application of EBZ200H Hard Rock Boring Machine in Peigou Coal Mine
EBZ200H硬岩掘进机在裴沟煤矿的应用
14.
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
15.
Research on the Tunnel Supporting and Propriate Coal Wedre Preserving under the Provide of the Upper Plate of Qiling Coal Mine;
七岭煤矿坚硬顶板条件下巷道支护及合理煤柱留设研究
16.
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
17.
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
18.
Research on the rock burst mechanism of coal tunnel wall being pushing out overall in Datong coal mining area′s "three hard" coal roadway
大同矿区“三硬”煤层巷道煤壁整体推出型冲击地压发生机理的研究