在暖通空调领域，涉及大量的流体输配管网分析问题。
In the domain of HV&AC, there are many problems about pipe network for fluid supply.
燃气输配管网的压力级制、管网型式、阀门配置和管径配置等是管网结构因素。
The pressure range of gas transmission and distribution network, network type, valve arrangement, pipe diameter arrangement, etc.
本文分析了我国石油输配管网系统的概况及其供应链组成，阐述了物流运输规划理论在石油管输网络优化中 的应用，并建立了石油输配管网优化模型。
This paper makes analyses on the contents of the road transportation planning, puts forward the methods for making the demands estimation, and determines the principles of planning and practicing.
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