Step-back technique; Curving root canal; root canal preparation; root canal condensation.
逐步后退法；弯曲根管；根管预备；根管充填。
Conclusion it is better apical sealing ability in root canals prepared by crown-down technique than step-back technique.
结论短期内冠根向预备技术比逐步后退技术成形的根管更有利于根管充填后根尖孔的密封。
The technique of back EMF induction in BLDC motor is analyzed, the "virtual neutral point" method and the technique of "3-step" start are introduced.
主要分析了反电动势感应方法，并阐述了虚拟中点法和三段式起动技术。
A kind of new forming technique to manufacture the back spring seat was proposed, called drawing-multi-step sinking with the cylindrical-forming process.
提出了一种生产后簧座的工艺方法：拉深—多步缩口—成形。
A kind of new forming technique to manufacture the back spring seat was proposed, called drawing-multi-step sinking with the cylindrical-forming process.
提出了一种生产后簧座的工艺方法：拉深—多步缩口—成形。
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