... 底部装药或孔底装药量bottom charge；base charge 初次爆破primary blasting 二次爆破secondary blasting；boulder blasting ...
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primary y blasting 一次爆破
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。
Based on the theory of protective engineering and blasting, the damage effects of primary fragments, shock wave and vibration in destruction of bygone aero-bomb and shell are discussed.
分别根据工程防护和工程爆破理论，对航、炮弹销毁时的弹片、冲击波和振动等安全距离计算进行了对比研究，有关研究结论可供销毁废旧航、炮弹的环境安全评估参考。
The gray correlative analysis is able to determine the primary and secondary relations of various factors affecting blasting effect.
影响爆破效果的因素很多，灰色关联分析能确定出影响爆破效果各因素的主次关系。
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