| 摘要 |
<p>The non-rectangular paving-stone has a two-part centre line at right angles to the horizontal cross-section. The latter cross-section comprises two identical right-angled trapezia (A) with partly-common right-angled sides (2), the two being offset along this side. The common part of the latter is enclosed by the long parallel sides (1). The ratio between the short parallel sides (5, 10), the long ones and the right-angled side can be 1:2:4.</p> |
