| 摘要 |
<p>The assembly has an elongated core bordered over length of two side wings (6), where each side wing is extended on a side of the core. Each side wing forms an obtuse angle at an end in an edge, where spacing of the wings in an upstream part is higher than spacing of the wings in a downstream part. The core comprises multiple central and longitudinal undulation zones (5). Each undulation zone is extended over width from the core. The undulation zones of the core are framed on sides of a plane zone (4c). The assembly is made of steel.</p> |
