导出奥利康和克林根贝尔格锥齿轮铣齿机差速挂轮比和分齿挂轮比计算通式；
In this paper calculation formulas of differential change gear raito and index change gear raito for Oerlikon and Klingelnerg bevel gear generating machines are derived.
目的评价内锥及外锥形椎弓根螺钉固定的生物力学特点。
Objective To evaluate two types of pedicle screw fixation strength.
紫锥菊提取物一般由草药的根或全株制成。
An Echinacea extract is usually made from the root or the whole plant of the herb.
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