45个桥里至少40个是吊拉索桥,这种结构最早的是金门大桥,1937年建成,其它国家的落后了多少年?
45个桥里至少40个是吊拉索桥,这种结构最早的是金门大桥,1937年建成,其它国家的落后了多少年?
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