MODEL OF WATER INRUSH FOR THICK WALL CYLINDER AT SIDE FACE OF PALEO-SINKHOLES IN NORTH-CHINA-TYPE COALFIELDS

 
  • 華北型煤田巖溶陷落柱側壁厚壁筒突水模式研究
今日熱詞
目錄 附錄 查詞歷史
国内精品美女A∨在线播放xuan