公路路线设计规范
Specification of the highway route design
非标管道设计
non-standard piping design
工程管道设计
Engineering pipeline design
管道设计
Piping design
line design
pipeline design
pipe Design
design of tubes
piping layout
design of air tube air pulsation
管道线路剖面图
profile of pipe-line route
三维管道设计软件
3D piping design software
市政排水管线设计
Design of Municipal Water Discharge Line