partial differential equation of first order
一阶偏微分方程
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The paper has used concise methods of logical analysis and reasoning to describe the relation between the first-order quasilinear partial differential equation and its system of characteristic...
对一阶拟线性偏微分方程与其特征方程组的关系，文中给出了简洁的逻辑分析和推导方法。
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