| 摘要 |
A flat plastic structure is provided with several horizontal, parallel rows of openings, each comprising several single, for horizontally attaching openings, alternating with several double, for vertically attaching openings. Each of the several single, for horizontally attaching openings has an upper and a lower wall converging inwardly from horizontal edges of those several openings. A flat bar for horizontally attaching centrally connects opposite vertical walls of each single opening. A double, for vertically attaching opening incorporates a vertically extending, centrally located apex-shape structure formed by a pair of intersecting walls diverging towards the back side. A flat bar for vertically attaching is located at each side of the vertically extending centrally located apex-shape structure connects opposite vertical walls of the double, vertically attaching opening.
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