砖瓦粘土

砖瓦粘土砖瓦粘土
  1. 试论砖瓦粘土企业的现状与发展趋势

    On the Present Conditon and Development Tendency of Brick Clay Corporation

  2. 浅谈山东省的砖瓦粘土替代资源

    Brief Introduction to Substitute Resources of Brick Clay in Shandong Province