超碰在线观看国产_91欧美精品成人综合在线观看_极品蜜乳国产一区二区三区在线_国产超碰人人做人人爽av动漫_一区二区三区毛片免费

 

    The structure of a single box house is mainly composed of four parts: a corner column, a neutral column, a bottom frame and a top frame. Welded steel and square rectangular steel pipes are used as standard components. The structure is simple and the installation is convenient and quick. The enclosure is composed of roof panels and wall panels. The components are assembled in the factory and the main structure forms an integrated unit: the roof panels use 75mm large wave tiles, and the wall panels use 50mm double-sided color steel sandwich panels.