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| 环形排列爆破由一平巷横向和径向钻出炮孔,装药后向空的或填充岩石的酮室爆破。这是一种生产爆破方法,其炮孔通常呈垂直状〈分段回采〉 | |||
| 环形炮孔爆破; 扇形炮孔爆炸; 扇形炮孔爆破 | |||
| ring blasting: 3 phrases in 2 subjects |
| Electronics | 1 |
| Explosives and Explosive Ordnance Disposal | 2 |
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