“drill collar”的概念、定义、翻译、参考文献-科学参考

单词	drill collar
释义	drill collar [`dril ´käl·ǝr] ^{DESIGN ENGINEERING} A ring which holds a drill bit and gives it radial location with respect to a bearing.
随便看	blowing cave blowing dust blowing fan blowing pressure blowing sand blowing snow blowing spray blowing still blowing-up furnace blow-lifting gripper blow molding blown asphalt blown film blown foam blown-fuse indicator blown glass blown oil blown tubing blowoff blowoff valves blowout blowout coil blowout dune blowout magnet blowout preventer

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。