国产日产亚洲欧美综合另类_一级毛片视频免费完整视频_国产无码久久一区_九九精品好操视频_久草精品视频分享

 

   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.