In addition, a pipe network description language for water supply system is designed to locate pipe networks in city terrain map.
给出一个管网系统(供水)的管网图形描述语言，使管网系统能快速准确地定位于地形图上。
Water supply system is a complicatedly dynamic nonlinear system, it is difficult to simulate by using one or several explicit functions in pipe networks.
由于供水系统是非常复杂的动态非线性系统，在实际管网的运行中，很难以一个或几个统一的显式函数关系描述管网的工况。
In drip irrigation system, the most effective length has great influence to the distribution and design of the system pipe networks.
滴灌系统中毛管的最大有效铺设长度对滴灌系统管网的布局和设计影响极大。
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