短語(yǔ)詞組短語(yǔ)bottom centre girder 底中桁雙層bottom side girder 旁底桁;旁桁材;船底邊縱桁;船底板bottom center girder 中底桁;橫剖線;支架Bottom center line girder 中內(nèi)龍骨bottom m side girder 旁底桁Girder bottom 底梁girder bottom plate 縱桁下翼板Tower bottom 's transverse girder 塔底橫梁 返回 bottom girder