| 摘要 |
<p>The slab is made from an insulating material and has a smooth base (1) with edge chamfers (3). The top of the slab has a series of rounded or trapezoidal projections (4) extending for practically all of its length, the projections being parallel forming regular grooves between them. The end of the slab is flat to house heating or electrical connections. Heating elements can be placed in the transverse grooves winding round the projections. The connection to the main heating can be in parallel or in series. The slab top is capped or dressed in situ.</p> |
