| 摘要 |
<p>A width adjustable, two face, expanded polystyrene panel includes a plurality of parallel, spaced-apart first slots open to a first panel face and a plurality of parallel, spaced-apart second slots parallel to said first slots and open to a second opposite panel face. Each of the second slots is situated in a plane equidistant from the planes of two adjacent first slots. The first and second slots overlap each other substantially. That is, each of the slots extends well past a plane parallel to the first and second panel faces and situated midway between those two faces. 19 L 9</p> |
