| 摘要 |
The element (9) has a formwork plate (24) comprising a formwork surface (29) and a rear surface opposite to the formwork surface. A connecting section (15) is fixed at the periphery of the framework surface. The formwork plate has a cross section (16) with a lateral projection (10) along a plane perpendicular to the connecting section, where the lateral projection presents small width for a large part of the wall of the basin to be formed. |
