ZY280b/16/8.5薄煤层支架底座内外主筋板镗孔工艺改进ZY280b/16/8.5薄煤層支架底座內外主觔闆鏜孔工藝改進 ZY280b/16/8.5박매층지가저좌내외주근판당공공예개진 Improvement of ZY2800/16/8.5 thin seam support base in- out main frame plate hole boring procedare
万方数据
山东煤炭科技山東煤炭科技산동매탄과기 Shandong Coal Science and Technology 2004年4期9-9,共1页
