摘要 |
The system has one end of a single-wall pipe in the form of a plug-in part and the other end in the form of a sleeve part, where both the plug-in part and the sleeve part have non-linear continuous sections. One end of a dual-wall pipe can be in the form of a plug-in part and the other end in the form of a sleeve part, where both the plug-in part and the sleeve part have non-linear continuous sections. |