| 摘要 |
<p>A block for use in construction, particularly though not exclusively paving, has top and bottom surfaces one of which is a rectangle and the other of which is a square or a rectangle. In the case where the other surface is a rectangle the block has the major axes of the rectangles mutually perpendicular and has a shape at mid-height in horizontal cross-section which is substantially a square and the length of the side of said square is within the range 66% to 300% of the height of the block. In the case where the other surface is a square, the major axis of the rectangle is greater in length than the side of the square and the said square has a side of length within the range 66% to 300% of the height of the block.</p> |
