摘要
20081319 Chi Yuliang(Institute of Geologic Exploration Technique of Jilin Province,Changchun,Jilin 130012,China)Design of Even and Odd Teeth Polycrystalline Bit and the Drilling Effectiveness in Oil Shale Formation(Exploration Engineering(Rock & Soil Drilling and Tunneling),ISSN1672-7428,CN11-5063/TD,34(3),2007,p.51-53,2 illus.)Key words:bits In