| 摘要 |
<p>A panel which comprises, among protrusions, flat sections, and recesses, the protrusions, and the flat sections or the recesses, the protrusions protruding from a predetermined reference surface, the flat surfaces being flush with the reference surface, the recesses being recessed from the reference surface. When the panel comprises the flat sections, the entire periphery of each of the protrusions is surrounded by flat sections, and the entire periphery of each of the flat sections is surrounded by protrusions, while when the panel comprises the recesses, the entire periphery of each of the protrusions is surrounded by recesses, and the entire periphery of each of the recesses is surrounded by protrusions.</p> |
