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- It is summarized and analyzed the strength characteristic of andesite and the principium of destroying rock of roller bit,take andesite for example. 以安山岩为例,总结和分析了安山岩的强度特性以及组合牙轮钻头的破岩机理。
- The operating performance quality of the roller bit, which is the most main broken crag tool, directly influence the well drilling quality, well drilling efficiency and well drilling cost. 牙轮钻头是钻井工程中最主要的破岩工具，其工作性能的好坏直接影响钻井质量、钻井效率和钻井成本。
- Study of Single Spherical Roller Bit 单牙轮钻头研究
- STUDY ON BELLEVILLE RING SEAL OF ROLLER BIT 牙轮钻头碟形圈密封的试验研究
- Keywords drillability;logging data;roller bit; 可钻性;测井资料;牙轮钻头;
- Design Improving for Driving Spindle of Four Roller Mill 四辊轧机主传动接轴设计改进
- Study on Strain of External Ring of the Four Roller Clutch 四滚柱式超越离合器外环拉伸应力计算研究
- Sealing mechanism of metal face seals for roller bit 牙轮钻头单金属浮动密封结构的密封机理
- Loading Analysis of the Plate Bending Housing - roll of Four Roller Mill 四辊轧机板坯下弯撞击机架辊的载荷分析
- Study on Roller Bit Rock-Breaking Power in Vertical Wells 直井牙轮钻头碎岩功率研究
- It is clear to all of us that two plus two is four. 二加二等于四对我们大家都很清楚。
- GA-Based Cluster Fuzzy Controller for a Four Roller Cold Rolling Mill 基于遗传算法的四辊可逆冷轧机恒张力聚类模糊控制器
- He wove four plots together into a novel. 他把四条情节编成一部小说。
- Laboratorial Research on Roller Bit Colliding with Borehole Wall 牙轮钻头与井壁碰撞的室内实验研究
- We have tea at four o'clock in the afternoon. 我们在下午四点钟喝茶。
- The town boasts four swimming pools. 这座城镇以拥有四个游泳池而自豪。
- Modification of Flat Base Roller Bit with Cone and Its Application 平底改锥体滚刀钻头及应用效果
- Our football team won by four goals to nil. 我们的足球队以四比零取胜。
- Study on Staging Testing of Soft Formation Roller Bit 软地层牙轮钻头台架试验研究
- He lay back and hit the ball for four. 他向后弯身击中球，得了4分。
