| 摘要 |
<p>Plastics panel has a number of mutually parallel corrugations, the mutual distance between the corrugations being large relative to their cross section, while the panel profile between each two corrugations is curved outwards. The outer corrugations forming the panel edges described an arc of more than 180 degrees in cross sections, so that the panel edges of two adjoining plastic panels can overlap and engage with each other.</p> |
