1.
Research and Application of Deep-hole Blasting Technology in Fully Mechanized Hard Coal Mining Face
综采工作面坚硬煤体深孔松动爆破技术的研究与应用
2.
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
3.
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
4.
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
5.
Basic Study on Technology of Pre-blast Weakening Hard Top-coal in Fully Mechanized Caving Faces;
综放开采坚硬顶煤预先爆破弱化技术基础研究
6.
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
7.
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
8.
Test on Hard Top Coal Pre-Blasting and Weakening for High Gassy Fully Mechanized Top Coal Caving Mining Face
高瓦斯综放面预先爆破弱化坚硬顶煤试验
9.
Determination of Pressure Step for Hard Roof at XV2306 Working Face in Wangtaipu Coal Mine
王台铺煤矿XV2306工作面坚硬顶板来压步距确定
10.
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
11.
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
12.
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
13.
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
14.
2 Calcium helps the body to make bones strong and hard. The hardness prevents bones from breaking later in life.
钙使人体骨质变得强壮坚硬。坚硬的骨头到了晚年会变得易碎。
15.
a rattling sound as of hard things striking together.
类似坚硬的物体互相撞击的卡嗒声。
16.
(biology) the normal rigid state of fullness of a cell or blood vessel or capillary resulting from pressure of the contents against the wall or membrane.
内部充满物体而饱满坚硬的状态。
17.
The epee is the dueling sword. The blade is stiffer.
重剑是决斗用剑，剑体比花剑坚硬。
18.
a small hard painless nodule at the site of entry of a pathogen (as syphilis).
病原体入口处坚硬无痛的节。