What's the difference between a keel and a truss in a building? It feels like putting on airs.

They are all shelves, but they are very different. Keels are dedicated to

Ceiling ceiling

Wall decoration

Generally speaking, there are

Wooden keel

and

Aluminum alloy keel

、

lightgage steel joist

Various panels are nailed to the outside of the keel and are generally used in houses.

interior decoration

. Trusses are specially used for roofs, including

U section steel

、

I-steel

Weld it and put it on it.

c type steel

purlin

Lay on purlins

Caiwa

General factory buildings are more common.