深槽宽叶片螺旋钻进技术在软硬复合煤体中的应用
侯红
Application of Auger Drilling Technology with Deep Grooves and Wide Blades in the Seam with a Combination of Soft and Hard Interlayers
煤炭工程 . 2018, (5): 68 -70 .  DOI: 10.11799/ce201805019