| 摘要 |
<p>@ A double walled panel (1) comprising on its small longitudinal sides (2a, 2b) a profiling formed in cross-section by a curved nose (7) which faces wide side surface (10), the base of which being situated at a distance from the same wide side surface (10) and a free-standing thickening (6) - as seen in cross-section - being disposed at the other small side (2a) and supported near the same wide side surface (10) fitting into an adjacent panel recess (5) enclosed by its curved nose (7).</p> |
