There exists a saddle type zone in the hydraulic moment curve of axial-flow pump blades which corresponds to the saddle zone of discharge-head characteristic curve of the pump.

轴流泵叶片水力矩随流量变化的关系曲线存在一个马鞍区，并与流量-扬程曲线的马鞍区相对应。

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Principle of negative hydraulic head and multi-pore materials were used to put forward a new setup and method for the measurement of soil-water characteristic curve.

负水头控制原理与多孔膜材料相结合提供了一种测定土壤水分特征曲线的新装置和新方法。

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Centrifugal pump characteristic curve on the efficiency of the highest point known as the design point, a pump at the point corresponding to pressure head and flow of work under the most economic.

离心泵特性曲线上的效率最高点称为设计点，泵在该点对应的压头和流量下工作最为经济。

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