So it is very important to study the optimum design of city natural gas pipeline network system.

因此进行城市管网规划设计的研究具有重大的实际意义。

youdao

So it is very important to study the optimum design of city natural gas pipeline network system.

因此进行城市管网规划设计的研究具有重大的实际意义。

youdao