制造规范
1、 暴露在室外环境中广告塔牌选用的型钢（钢管、槽钢和扁钢）的最小壁厚不得小于3mm，选用的圆钢直径不宜小于10mm，焊接结构的角钢不宜小于?N45×4或?N56×36×4，螺栓衔接的角钢不宜小于?N50×5。
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