girdern.[建]大梁
girder grillage梁式承台,钢梁格床,桁架
girder elevator提梁机
girder propping安顶梁
girders in frame车架多层梁
girder stiffener大梁加劲杆
girderless tloor无梁楼盖
girderless floor无梁楼板
girder structure梁式结构
girder connection大小梁联接,梁节点
girder guard rail板梁护轨