1.
Application of Combined Slotting in Driving Hard Rock Roadway
混合掏槽技术在坚硬岩石巷道掘进中的应用
2.
hard rock coring tool
坚硬岩石井壁取心器
3.
A machine that bores through hard surfaces, used especially for tunneling through rock.
凿岩机一种钻孔于坚硬表面的机器，尤用作凿穿岩石的隧道
4.
Middle-Deep Bore Blasting Experimental Study on Hard Rock Tunnel Heading
硬岩巷道掘进的中深孔爆破试验研究
5.
Drilling and Blasting Technology of Hard Rock in New Ventilating Shaft in Zhangxin Coal Mine
张新矿新风井坚硬岩石凿岩爆破技术
6.
Any of various hard, dark - colored rocks, especially basalt and chert.
暗色岩一种坚硬、暗色的岩石，尤指玄武石及燧石
7.
Of, relating to, or resembling rock, especially in hardness; stony.
坚硬的，石质的岩石的，与岩石有关的，或岩石状的，特别指硬度方面；坚硬的
8.
Discussion on Integral Mechanization Construction Technology of Rock Drift
岩石巷道综合机械化施工技术的探讨
9.
Study on Mechanism of Rock Localization Deformation and Bifurcation Instability of Roadway Surrounding Rock;
岩石局部化变形与巷道围岩分岔失稳机理研究
10.
Vitreous rocks are hard and shiny.
玻璃状的岩石坚硬而晶莹闪光。
11.
This machine can bore through solid rocks.
这台机器能够钻透坚硬的岩石。
12.
they found a bed of standstone.
这一地层的岩石非常坚硬。
13.
Kentish rag
肯特郡产坚硬砂质石灰岩
14.
Technical Study and Application on Middle Deep Hole Smooth Blasting for Hard Rock Tunnel;
硬岩巷道中深孔光面爆破技术研究和应用
15.
Research of the Vibration Velocity Attenuation Law of the Particle in Wall Rock Bursting Where Hard Rock Tunneling Advances Rectangularly
硬岩爆破掘进对直角拐弯后巷道围岩中质点振速衰减规律的研究
16.
Model Test on Failure Mechanism of the Surrounding Rock of Oblique Laneway inSeepage Thick Gravel Stratum
渗水厚砾石层斜井巷道围岩破坏机理模型试验
17.
Practices and control technology on floor heave prevention of soft rock roadway in Xiashijie coalmine
下石节煤矿软岩巷道底臌防治技术与应用
18.
Research of fast comprehensive tunnelling technology on deep well highland pigeonhole rock Tunnel
深井高地压岩石巷道快速综合掘进技术研究