The commonality of the geometric parameters and the factor of safety in the grouping can again be seen in both estimates. 在这两个估计式中，都有共同的几何参数和安全系数的组合因子。
The method is to study the alterative trend of performance characteristics when the geometric parameters change. 第三，多模型比较研究，考察主要几何参数变化对泵性能的影响。
