If bicycle pump, then the alignment hole - by-blow look at a better effect.
如有自行车打气筒，则对准小孔逐个吹一下效果更佳。
It can improve gas suction effect, reduce drilling hole amount and save construction investment.
采用优化后的方法可以提高瓦斯抽放效果，减少钻孔数量从而节省施工投入。
Air hole structure incorporating our airy effect.
泡棉透气结构具有通爽作用。
It was better to observe the trichomonacidal effect with hole method.
用打孔法观察药物杀虫效果较好。
The hole diameter has little effect on the efficiency.
孔径对效率影响不大。
Simulation on effect of stemming length to deep hole bench blasting;
大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
Simulation on effect of stemming length to deep hole bench blasting;
大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
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