About CHEN H
About Research Inst. Exploration and Development Beijing
About CHEN Z
About Research Inst. Exploration and Development Beijing
About Shiyou Xuebao
About finite element method
About directional drilling
About bit
About orbit(trajectory)
About force
About analysis
About utensil
About deviating tools
About 坑底アッセンブリ
About Drilling
About 有限要素法
About アッセンブリ
About 動的解析