钢结构焊接连接的优点有对几何形体适应性强、构造简单、不削弱截面、易于自动化；除此之外，还具有（）的优点。

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【多选题】【消耗次数：1】

① 省材

② 省电

③ 省工

④ 功效高

⑤ 质量好

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