PE波纹管,PVC波纹管,排水管道波纹管装线波纹管生产厂家型号规格全集;PE波纹管,PVC双壁波纹管一、HDPE双壁波浪纹有哪几种规格型号?DN200mm,钢带波纹管,DN300mm,DN400mm,DN500mm,DN600mm,DN700mmDN800共六种二、现阶段销