General project: Metal structure manufacturing; Metal structure sales; Project management services; Residential hydropower installation and maintenance services; Container sales; Container rental service; Container maintenance; Container manufacturing; General mechanical equipment installation services; Furniture installation and repair services; Household appliance installation services; Metal tool making; Metal material manufacturing; Metal material sales; Hardware product manufacturing; Hardware products retail; Hardware products wholesale; Electronic special equipment sales; Machinery and equipment sales; Sales of electrical and mechanical equipment; Electronic and mechanical equipment maintenance (excluding special equipment); Sales of metal products; Building materials sales; Sales of building decoration materials; Sales of mechanical parts and spare parts; Sanitary ware sales; Fire equipment sales; Lighting appliance sales; Sales of building ceramic products; Sales of sanitary ceramic products; Sales of special ceramic products; Metal product repair; Building decoration, plumbing parts and other building metal products; Glass fiber reinforced plastic products sales; Glass fiber reinforced plastic products manufacturing (in addition to the projects subject to approval according to law, independently carry out business activities according to law with the business license) License projects: All kinds of engineering construction activities; Construction project design; Residential interior decoration; Construction labor subcontracting (for projects subject to approval according to law, business activities can only be carried out after the approval of relevant departments, and the specific business projects shall be subject to the approval result)