mass conservation and energy conservation 物料和能量平衡 ; 质量守恒和能量守恒
energy and mass conservation 能量和质量守恒
In term of mass and energy conservation, the calculation method of simplified source of explosion was put forward;
根据质能守恒方程，提出了简化爆源的计算方法；
Design and testing of these physical systems rely on standard design practices that employ the laws of conservation of force, mass, and energy.
这些物理系统的测试依赖于对作用力、质量和能量守恒定律的标准设计实践。
Based on the mass conservation law, the energy conservation law and some empirical equations, the dynamic model is built.
根据基本的质量守恒定律、能量守恒定律以及一些经验公式等建立了系统的动态数学模型。
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