The technique of primary drilling and blasting is an effective way to solve the problem of crushing, caving and transportation.
该方法的初采钻爆技术是解决顶煤破碎与顺利放出的有效途径之一。
2
The primary and secondary dry crushing and associated dry screening systems are designed and sized to operate 6000 hours per year or 68.5 percent of total time.