... equation principle : 均衡原则 equation of variation : 变异方程；变分方程 technical equation : 技术方程 ...
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equation of variation type 变型方程
equation of first variation [数] 一次变分方程 ; [数] 第一变分方程
equation of energy variation 能量变化方程
Second, a criterion of the stability of relative motion for the nonholonomic mechanical systems was obtained by using the equation of variation of energy.
其次，基于能量变化方程，给出了非完整力学系统相对运动的稳定性的一个判据；
The mass transfer equation was introduced into heat transfer model of falling film evaporation. The radial velocity, mass diffusion coefficient and variation of film thickness were taken into account.
将传质方程引入到垂直管降膜蒸发传热模型中，求解时考虑了径向速度、质量扩散系数和膜厚变化对传热的影响。
Derives an equation set to reveal the influence of water flow variation on temperature of the heated room and permitted fluctuation of the hydraulic imbalance degree of pipeline.
推导出了水流量变化对供暖房间温度的影响以及管路水力失调度允许波动的取值范围，指出循环水量减小时对室温的影响较水量增加时为大。
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