微粒的角动量，质心分离以及相对坐标系，有效能量图。
Angular momentum for particles, separation of center-of-mass and relative coordinates, effective energy diagram.
通过分析平板膜超滤分离过程，描述了超滤过程动量传递和质量传递的微分方程，求解方程得到速度分布和浓度分布曲线。
By analyzing the ultrafiltration process of flat membrane, differential equations of momentum transfer and mass transfer describing the process are established.
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