“downhole drill”的概念、定义、翻译、参考文献-科学参考

单词	downhole drill
释义	downhole drill [`dau̇n´hōl `dril] ^{MINING ENGINEERING} A hammer or percussive drill in which a reciprocating pneumatic piston is located immediately behind the drill bit and can follow and enter the bit down the hole, for minimizing energy losses.
随便看	principal normal principal normal section principal part principal plane principal plane of stress principal point principal quantum number principal radii principal radii of normal curvature principal ray principal root principal section principal series principal strain principal stress principal value principal vertical circle principal visual ray principle principle of coincidence principle of covariance principle of duality principle of dynamical similarity principle of equivalence principle of inaccessibility

科学参考收录了103327条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。