手机在线观看免费av,懂色一区二区三区免费观看,欧美第一视频,可以在线观看的黄色网址

The F-LH series steel truss is designed and manufactured for replacing the solid belly H steel trusses in the floor system of steel structure buildings.

The double angle steel is used as the chord, and round steel, round pipe or angle steel are used as abdominal members.

In the steel structure building, the steel truss trabeculae not only save the amount of steel for the whole floor, but also because a large number of pipes can pass through the steel trusses, and the height of the floor can be saved.

Floor structure, such as 9~18 meter span floor trabecula.