stem bit 中文意思是什麼
stem bit
解釋
術聲回轉鉆機-
Field operation shows that, by using the hydrodynamic propulsor, not only the penetration rate is increased, the vibration of the bit and drill stem is reduced as well, thereby the service life of the bit is extended
1995 - 1998年井下液力推進器在大港油田等地區不同區塊20餘口井上施工的實踐證明,使用這種推進器不但可以提高機械鉆速,而且減輕了鉆頭和鉆桿的振動,進而延長了鉆頭壽命。 -
Conceptual, word stem, and soundex searches are possible within the current general framework, but would take quite a bit of work
概念上,詞乾和探測法搜索可能已在現有的基本框架之中,但其需要花費很大的工作量。
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