| 摘要 |
<p>The system has linear channel sections. Each section is molded of cement mortar reinforced with fiberglass. The hollows left in the fiberglass and cement mortar mixture are filled with light material e.g. polystyrene, polyurethane, beeswax, cork. Each section is also formed to tapered, semicircular, rectangular cross-section and further reinforced with outer stiffeners.</p> |
