| 摘要 |
<p>The support has a dished top (1) and a vertical rim. The rim has three cut-outs (6,7,8) leaving three peripheral feet (3,4,5). The length of the feet is twice as long as the length of the cut-outs between them. The top periphery of the support has a rebate (9) forming a locating plateau (10) for the feet of the next carrier. The arrangement is stable because of the overlapping of the support feet between one carrier and the next, due to ratio of the length of the feet to the length of the space between them.</p> |
