R&D, technology promotion, production and sales of brush products, labor protection articles, masks and Class I and Class II medical devices; Processing and sales of machinery, hardware accessories, plastic products, plastic products, packaging products and fabric products; Sales of agricultural and sideline products, poultry and livestock, aquatic products, handicrafts (excluding cultural relics), daily necessities, electronic products, building materials (excluding sand, stone, soil and other resources), decorative materials, non-woven fabrics, hot air cotton and meltblown fabrics; E-commerce; Electronic information consulting service; Import and export trade (except those restricted or prohibited by the state); Construction engineering, landscaping engineering and decoration engineering construction; Design, production and distribution of domestic advertisements. (Projects that must be approved according to law can only carry out business activities after being approved by relevant departments)