tow-centered arch

When drilling with bicenter bits, several problems have been encountered, such as drilling a smaller- than - expected hole, the instability of bottom hole assembly (BHA), and hole deviation tendencies that make the bit extremely weight sensitive.

针对使用双心钻头钻进时扩孔尺寸不理想、钻具工作不稳定、井斜趋势引起钻头工况对钻压非常敏感等问题,对底部钻具组合的受力、变形和运动状态等方面进行了分析研究表明,由于双心钻头几何设计的独特性,工作时钻头上受有不平衡力,这使得钻头切削不稳定,且影响钻柱变形。

Clinical fixing of heartbeat machine to the expended myodcardium patient s double-heartroomsdouble-heartrooms;

双心室起搏器给扩张型心肌病患者的临床安装

Profundity Hidden below Triviality and Obscurity:An Interpretation of Hemingway s Big Two-Hearted River;

藏于琐碎与晦涩之下的深意——海明威《大双心河》解读

Ecological Perception Of Big Two-Hearted River;

《大双心河》的生态解读

Recent theories of narratology finds two narrative perspectives, namely that of the narrator as well as that of Nick, in "Big Two-hearted River".

《大双心河》采用人物尼克的和无名叙事者的两个叙事视角。