Traditional Culture Encyclopedia - Hotel franchise - What are the structures of the bedstead base?

What are the structures of the bedstead base?

(1) polyethylene box (specially designed for the environment with high air humidity)

(2) Flat box with steel frame structure (strong bearing capacity, durable, suitable for heavy bodies and meeting all kinds of people in hotels)

(3) Spring box

(4) Storage box

(5) Solid raft plate skeleton structure