| 摘要 |
<p>1. Building element for the construction of basic components for building structures having the basic form of a flat rectangular broad stone, in the base surface of which a groove (1) is provided in the form of a trapezium, the longer side of which forms the groove base, and which is provided with at least one recess (2) extending along one of its short edges, characterised in that the recess (2) is provided on the side opposite the base surface with the groove (1) and that the two surfaces, which together form the recess (2) include an acute angle.</p> |
