| 摘要 |
The dimensions of the longitudinal and transversal walls are such that with a dimension n of the transversal side wall the dimension of the longitudinal side wall is at least 2n. An inner dividing wall extending vertically to the longitudinal side walls forms at least two equally sized chambers, whose lower end (11) is united to the underside (3) and its upper end (12) extends over an upper side (4) being formed slightly conically, in order to fit into a tubular component (9) of a plastics tile fitted above or below it. The dimension of the longitudinal side wall amounts to three times the dimension n of the transversal side wall and three chambers are provided. |
