The traditional galvanized steel tube and ordinary drainage iron pipe due to easy to rust, since the major, transportation construction inconvenience of reason has gradually be replaced.

传统的镀锌钢管和普通排水铸铁管由于易锈蚀、自重大、运输施工不便等原因已逐渐被取代。

youdao

After the diagram model of order and transportation model of the steel pipe is built, change-edge and optimizing methods were introduced and an optimal solution was achieved.

利用图论知识建立了钢管订购和运输的二部图模型，提出了去边法与方案的优化调整方法，得到了问题的最优解。

youdao

Use: as a single coat anticorrosive FBE coat for exterior steel pipe line for transportation of oil and gas, water and other finished products.

应用领域：主要应用于各种输油、输气、输水等钢质管道的外壁防腐。

youdao