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导洞与层阶法 meaning in English

heading and bench tunneling method

Related Words

  1. 洞洞板
  2. 洞洞装
  3. 毛洞洞
  4. 导洞口
  5. 导洞梯段挖法
  6. 导洞掌子面
  7. 导洞支撑
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