| 摘要 |
<p>The system has frames each consisting of two horizontal tubes (14a,b), at least one, and preferably two, vertical tubes (14c 14d), and horizontal bars (14f) in one or more sections, divided, if necessary by a vertical bar (14e). The anchor plates are fixed to the ends of the horizontal tubes (14a,b), and each plate has one or more sets of marking points for fixings positioned eccentrically or symmetrically over the plates surfaces.</p> |
