The profiles are welded by HDPE extrudant at the profile edges which is overlapped by a winding and welding machine to form the pipe. 成型的管材呈螺旋直肋结构,聚乙烯管壁外表面有等间距螺旋环绕的肋片加强。
We climb - along the winding broken roads, around fallen trees and crushed cars, past one smashed rustic hostel after another. 我们沿着蜿蜒的碎石路攀爬着,在倒下的树和压垮的车的环绕下,经过一个又一个喝醉酒的乡村旅店。