| 摘要 |
The narrow side surfaces (9,10) of the flat object is built with incorporated two-piece element section, and is made up of two multiple right-angled curved connection arms (1,2). There is a moulded fillet (3) on the inner edge of the foldings. The web sections (4,5) may have three reinforcement ribs (6-8) on its outer sides, from which two (6,7) may be parallel to both narrow-side surfaces and the other may run in the plane of the angled halves (W) of both narrow-side surfaces.
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