| 摘要 |
The ramp comprises sections telescoping together (1,2). Each section is Z-shaped with a web (3,6) and flanges (4,7;5,8) extending upwards and downwards. - Each web flange has a relatively high and a relatively low part, the high ones being bent over at the ends (4',8') and then back 4'11,8'') to fit round other (5,7) and provide mutual guidance.(3) |
