Water-supply pipe network is the lifeblood of urban construction, the management of city pipe network is the essential part in urban planning and urban construction.
供水管网是城市建设的生命线，城市管网的管理是城市规划和城市建设的重要环节。
Urban drainage pipe network is important establishment of a city.
城市排水管网是城市的重要基础设施。
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。
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