| 1. | In 1898 , the yukon territory of canada was organized
1898年，加拿大育空区建立。 |
| 2. | Technical research on adjusting shaft water with goaf water
利用老空区调控矿井水技术 |
| 3. | Disposal of the irregular mine goaf in sandaozhuang mining district
三道庄矿区不规则空区的处理 |
| 4. | Research on technique of controlling mine water with old goaf water
利用老空区调控矿井水技术研究 |
| 5. | Grouting and water sealing technology for mine shaft sinking through water flooded goaf
井筒过积水老空区的注浆堵水技术 |
| 6. | Analysis of the highway influenced by mine goaf under the hunan leiyi highway
耒宜高速公路路基下采煤空区对公路的影响分析 |
| 7. | Thinking and research on disposal of complex vacant places by medium and deep - hole method
中深孔爆破处理复合空区的思考与探索 |
| 8. | Evaluation of the safety of combined mining of thin seams under water body in mined area
老空区水体下薄煤层联合开采的安全性评价 |
| 9. | Hubble deep field
哈勃深空区 |
| 10. | Test on blasted ore - formed inclined platform method for mining of deposit with multi - mined - out areas
多空区矿体斜面蹬碴落矿采矿方法试验研究 |
