短語(yǔ)詞組短語(yǔ)flat hollow steel box girder 扁平空腹鋼箱梁flat steel box shaped girder 扁平鋼箱梁Flat Side Main Steel -box Girder 扁平邊主鋼箱梁flat steel -box-girder 扁平鋼箱梁 返回 flat steel box girder