摘要
20072300 Chen Xinping(Integrated Geological Team of the Shaanxi Bureau of Geology and Mineral Resources,Weinan 714000)Construction Technology of Upward Vertical Hole Used in the Heihe Dam(Geology of Shaanxi,ISSN1001-6996,CN61-1150/P,24(2),2006,p.57-59,with English abstract)Key words:exploration drilling