| 摘要 |
A building panel of arcuate longitudinal form having a pair of upstanding flanges at its opposite longitudinal sides, a male rib supported by one flange and a female rib supported by the other flange, both the male and female rib extending wholly to one side of their supporting flanges, the male rib being engageable with a female rib of an adjacent panel to form an arcuate self supporting roof section for a building. |
