bolted and welded steel bridge的意思|示意
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螺栓和焊接钢桥
bolted and welded steel bridge的网络常见释义
栓焊钢桥 ... 全焊钢桥 all welded steel bridge 栓焊钢桥 bolted and welded steel bridge 铝热焊钢粉 Thermit Steel ...