| 摘要 |
The pipe (1) has a cover wall (13) provided with regions (131, 132) connected with one another, where the regions have respective radius of curvatures (R1, R2) and the cover wall is arc-shaped curved. The radius of curvature of one of the regions is greater than the radius of curvature of the other region. The radius of curvature of the former region corresponds to 5,5-times of 7-times of interior height (H) of the pipe and the radius of curvature of the latter region corresponds to 1,4-times of one time of the interior height of the pipe. |
