first-order partial differential equations--
first-order partial differential equations--
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 。
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Following the theory on characteristics of first order quasi-linear partial differential equations, classification of the balance equations for two-phase flow in interior ballistics is discussed.
根据一阶拟线性偏微分方程组的特征理论，讨论内弹道两相流方程组的类型。
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