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Energy variation principle is a good method to solve the shear lag effect.
能量变分法是求解剪力滞问题的一个有效方法。
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Ray equation is derived from Fermat's principle in variation form.
本文由费马原理的变分形式，导出光线微分方程。
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Ray equation is derived from Fermat's principle in variation form.
本文由费马原理的变分形式，导出光线微分方程。
youdao