| 摘要 |
<p>The roofing component is used in civil engineering. It is inthe form of a plate (1) of steel sheeting having irregularmultiside shape, having two by two equal opposite sides and afitting aperture (6). Ribs (2, 3, 4, 5) are provided along theperiphery of plate (1) which are produced by folding the ends ofthe steel and are formed differently. Some of the ribs (2 & 3) lieon the upper surface of the plate and the other ribs (4 & 5) -under its lower surface. A coating of titanium base is applied onthe roofing component.(11) 272</p> |
