We have developed curve models and derived curve equations respectively.
建立了三部分的相应屈曲模型，导出了相应的屈曲方程。
Single form site index table was constructed after derived curve was expanded by differential method.
用差分法展开导向曲线，编制了单形立地指数表。
Basic formulas for the calculation of bar to bar voltage distributing curve of DC motor commutator are derived and test-verified.
文中导出了计算直流电机换向器片间电压分布曲线的基本公式和试验验证；
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