短语词组短语floor r slab 地台hollow floor -slab 空心楼板floor plug slab 地板structure floor -slab 结构楼板floor -slab 楼面板spot -cast concrete floor-slab of house 住宅现浇楼板cast -in-situ floor-slab 现浇楼板ribbed floor slab 肋形楼板 返回 floor slab