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分析了国内外输气管道优化设计的情况，探讨了输量逐步增长的情况下，长距离输气管道的分期建设方案。建立了数学模型，并编制了优化设计软件。
This paper analyzes the optimal design of gas pipelines both at home and abroad, and discusses the staging scheme of long-distance gas pipelines under the condition of gradual increase in transmission volume. Established a mathematical model, and the preparation of the optimal design software.