| 摘要 |
<p>The block (2) is made up of two sections (4,6) of the same height (H) and length (l), joined together by connecting bridges (8) which can be broken to separate the sections and give two part-blocks of different widths. The vertical faces of the part-blocks have male and female surfaces, and the connecting bridges are located between the female surface of one part block and a flat surface on the other one.</p> |
