| 摘要 |
The wedge (200) has a laying surface (220) comprising multiple laying degrees with reception surfaces (222, 223, 224). The reception surfaces define laying planes (212, 213, 214), respectively. Each laying degree describes a concave cylindrical reception surface, where radius of curvature of the cylindrical reception surface is about 140 to 160 mm. The successive reception surfaces are separated from each other by a stop part that comprises crowns (231, 232, 233), where altitude of each crown is higher than that of mating planes of the successive reception surfaces. |
