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竖井开拓 meaning in Chinese

opening up by vertical shafts
openingupbyverticalshafts

Related Words

  1. 开拓阶段
  2. 隧道竖井
  3. 竖井盖
  4. 竖井井筒
  5. 上行竖井
  6. 补给竖井
  7. 竖井抓岩机
  8. 电缆竖井
  9. 挖竖井
  10. 圆竖井
  11. 竖井开采法
  12. 竖井开采矿
  13. 竖井开挖
  14. 竖井口
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