而在市政供水管网中，则很难得到一条确定的管路特性曲线。
The municipal water supply networks, is very difficult to determine the line of a curve.
它使水泵扬程不确定，而是沿管路特性曲线移动(参见图3)。
It pumps lift the uncertainty, but along the pipeline characteristics of mobile (see Figure 3).
其调节方式不外乎以下两种：管路特性曲线的调节，如关阀调节；
Its regulation either of two ways: the curve of pipeline regulation, such as customs regulating valve;
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