Sales of building materials; Sales of building decoration materials; Sales of household goods; Industrial engineering design services; Import and export agent; Domestic trade agent; Import and export of goods; Technology import and export; Sales of new energy original equipment; Sales of photovoltaic equipment and components; Sales of solar thermal utilization products; Solar power generation technical services; Sales of solar thermal power generation equipment; Battery sales; Sales of mechanical and electrical equipment; Sales of power electronic components; Sales of plastic products; Hardware product retail; Wholesale of hardware products; Metal structure sales; Sales of daily ceramic products; Sales of lamps; Sales of lighting appliances; Wire and cable business. (Except for projects that must be approved according to law, independently carry out business activities according to law on the basis of business license), and the permitted business projects are: Residential interior decoration; Construction engineering design.