Least square method of polynomial or the method based on the given function are used to fit pump characteristic curve in pump selection or operation.
在水泵的选型或运行中，通常采用多项式的最小二乘法或根据假设的函数关系来拟合水泵性能曲线。
The paper discusses the process design method of vacuum system in chemical plant and the selection method of the key equipment - vacuum pump in the vacuum system.
论述了化工生产中真空系统的工艺设计方法及真空系统中关键设备真空泵的选择方法。
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