As for the seams with different mine geological conditions, a site measurement should be made for the area of the seam pressure released zo...

 
  • 對于不同礦山地質(zhì)條件下的煤層,必須實(shí)測其工作面煤層卸壓帶和塑性極限應力區范圍,才能準確確定鉆孔瓦斯涌出初速度合理的測試深度。
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan