| 摘要 |
<p>A multi-directional structure useful for reinforcing purposes has more than four bundles each constituted by a plurality of regularly spaced, parallel, rectilinear elements. The directions of at least five of the bundles are oriented parallel to at least five of the ten directions defined by the lines connecting the non-contiguous vertexes of a parallelepiped in two's, with the bundles taken three's not constituting a system in which each bundle is perpendicular to the other two,</p> |
