| 摘要 |
<p>The cover has individual plates (1) hingedly connected with each other by an internal hinge (2) and comprising buoyant plate bodies (4) made of hard foam. The plate bodies of the selected plates are provided with through-flow openings (5) for an insert (6) that accommodates or forms a lining. The insert has two parts (7, 8) between which the plate bodies are clamped during connection of the parts, where the parts surround opening edges of the bodies and screwed with each other by connection screws (9).</p> |
