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- 双级PDC钻头two-stage PDC bit
- 双pair
- 利用井底应力场研究双级钻头导扩眼直径比Research on diameter ratio of pilot to enlarger of two-stage bits using bottom-hole stress field
- 双击double-click
- 胎体PDC钻头烧结模具快速成型新工艺A new manufacture process of the mould for matrix PDC bits
- 双级筛two-stage sieves
- PDC钻头双圆弧冠部轮廓曲线研究A study of double arc crown profile of PDC bits
- 双级喷射器duplex injector
- 双级决策bilevel decision - making
- 双级气浮double air flotation
- 双级耦合double stage coupling
- 双级热泵double-stage heat pumps
- 双级时效double aging
- 双级压力two-step output pressure
- 双级跃迁double quantum transition
- 双级水泵tow-stage pump
- 双级固井two stage cementing
- 配组双级two-stage
- 双级斜管two-stage inclined pipe
- 双级固溶two-stage solution
