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Terms for subject Explosives and Explosive Ordnance Disposal containing 螺旋形 | all forms | in specified order only
| Chinese | English |
| 螺旋形炮孔布置 | spiral arrangement of holes |
| 平巷掘进中螺旋形钻孔爆破法一种平巷掘进方法,其炮孔径向于平巷中心分排钻出，每排炮孔的深度相继提高。当一排炮孔爆破时，清除出一饼状岩块。若总面积分成16块,且每循环下沉1.6m,则每炮孔排各增加深度0.1m。需采用专门机械来屏蔽爆炸区与钻孔和装药区 | spiral drill-and-blast concept in drifting |