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| 扩槽炮孔巷道掘进时，除掏槽孔、辅助掏槽孔、周边孔以外,将掏槽向周围横向扩大的炮孔。 wall hole | |||
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stoping hole : 4 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 3 |
| Technology | 1 |
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