The highseam drill 2000 is stainless steel construction and the cylinder rods of the 1st inner legs of the stinger and drill leg are stainless steel.
这种厚煤层钻孔机2000是不锈钢结构，钻头第一内部腿架的活塞杆和钻孔机支架都是不锈钢的。
2
Cavern development is the main controlling factor of high productivity and large reserves amount, while fracture development improves connectivity of seam cavern system.
溶洞发育是较高产能和较大储量规模的主控因素，而裂缝发育扩大了缝洞系统的连通性。
3
A new process of high speed seam welding with secondary rectification for double seam possesses good weld quality, high welding speed, smooth bead and low consumption features.