立边板肋具有极佳的防漏水性能，不需打胶，暗扣方式固定，表面无外露螺钉，免得污染老化问题。

Rib of slab has prominent water-proof capability. It is fixed by hidden key without any glue. No bolt on the outside surface which prevent from pollution and aging.

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固定方式：采用暗式螺钉和异形件方式固定。

Fixing mode: it is fixed by means of concealed screw and shaped part.

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