“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	olivary nucleus olive olive hole olive infused oil oliveiraite olive knot olivenite olive oil Oliver filter olivette olive tubercle Olividae olivine olivine basalt olivine-bronzite chondrite olivine diabase olivine-hypersthene chondrite olivine nephelinite olivine-pigeonite chondrite ollenite Ollier's disease OLRT system Olsen ductility test Olympus Mons omasum

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