| 摘要 |
An approximately cuboidal or frustopyramidal, partially hollow marking element provided with a flat bottom plate, with a main body which is stiffened by ribs and which is connected at two mutually opposite sides to preferably reflecting bars, wherein the marking element only comprises the bars (1) and the main body (2) which is integral with the bottom plate (3) and in the interior of which a plurality of ribs (5) extend normal to the bars (1) but on the other hand at most one rib (4) extends parallel to the bars (1). |
