| 摘要 |
<p>The plate has a quadrangular shape and includes a fixing unit that couples the plate to an upper end of a suspension structure of a unitary suspension device (1). Four edges (9a-9d) of the plate are raised and an upper face presents a convex surface (10) around an orifice to form a dome under a horizontal pane defined by the raised edges. The upper face defines another set of convex surfaces in regions of the four edges.</p> |
