two-layer plastic pipe 双层塑料管
Extrusion die design for compound triple-layer plastic pipe by two extruding machines is introduced.
介绍用两台挤出机共挤复合三层塑料管材机头的模具设计。
Pipe network with the actual needs of extracting data to produce two-dimensional display of the road layer to complete the address matching and its rendering.
结合管网的实际需要提取数据，制作供二维展示的道路图层，完成地址匹配及其渲染技术。
Reform the common layer house with cages to the type of vertical ventilation system. Set up exhaust pipe at two sides of house end for install larger exhaust fans.
对普通的笼养种鸡舍进行纵向通风改造，在鸡舍末端两侧墙壁设置抽风通道，用于安装大直径风机。
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