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| 锥形割槽 | |||
| 锥形掏槽倾斜孔掏槽的一种形式，是V形掏槽的变种，适用于小断面巷道掘进。锥形掏槽因其掏槽孔底向一点集中，掏槽的形状似锥体而得名。有下述3种形式: 1. 三角锥掏槽。 2. 四角锥掏槽。 3. 多角锥掏槽 | |||
| 锥形掏槽 | |||
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conical cut : 2 phrases in 1 subject |
| Metallurgy | 2 |
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