逐步后退法（step-back technique）： 可用于轻中度弯曲或直根管的根管预备方法，先用小器械从根尖开始预备，逐渐用较大的器 械向冠方后退预备，以避免标准技术在弯...
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Passive step-back technique 被动逐步后退法
modified step-back technique 改良逐步后退法
back sliding step technique 背向滑步技术
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。
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。
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