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| 阶梯式开采 | |||
| 台阶式开米对露天矿未采区逐台阶开挖的施工方法 | |||
| 台阶式开采 | |||
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bench mining : 6 phrases in 2 subjects |
| Explosives and Explosive Ordnance Disposal | 4 |
| Technology | 2 |
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