(3)公式推导 (3)公式推导(Derivation of the formula) 公式推导(Derivation z 假设m 上的弯矩为M 假设m-m,n-n上的弯矩为M +dM 和M+dM.两截面上距中性轴 y y1 处的正应力为σ1 和σ2.
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The formula of reliability index is calculated in the origin space directly, so derivation and orthogonal transformation are avoided.
所用的可靠度计算公式直接在基本变量空间中求解，避免了繁琐的求偏导数和正交变换工作。
The derivation of acid base titration error formula is a difficult point as well as an important point in teaching analytical chemistry.
酸碱滴定误差公式的推导是分析化学教学的一个难点，也是一个重点。
The improved formula not only has the more simple form for the derivation of the function, but also much less computer time than the Lagrange method.
与常用的拉格朗日插值方法相比，改进后的公式不仅一阶导数形式简单，而且计算量也小得多。
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