| 摘要 |
<p>The panel, produced by extrusion, consists of two outer layers (1, 2) and transverse partitions (3) at intervals. It also has at least one additional inner layer (4, 5) which lies parallel to the outer layers and set at a small distance from them, and the inner square- or rectangular-section spaces (9) are divided in two by diagonal vanes (8). The inner layers (4, 5) are thinner than the outer ones, and the panel has an overall thickness of 16-40 mm, and a weight of 2.5-5 kg/mm<2>.</p> |
