| 摘要 |
One or more cross-struts (36) can be provided at the top of the section (10), to reinforce it and/or support covering gratings. The height of the section can be adjustable by screws, and one of its walls can have an inclined surface, so that the trough (14) is narrower at the bottom. The inclined surface can be formed by an inside wall (30). Teeth can be formed at the top edge of one or both walls, engaging between the grating bars.
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