Vacuum equipment and its accessories and consumables, mechanical equipment and its accessories, electronic products and accessories, measuring instruments, lighting products, technical development, technical consultation, sales, on-site maintenance of computer software and hardware; Laboratory supplies, hardware tools, labor insurance Sales of supplies and household appliances; Information technology consulting; E-commerce business (if a pre-administrative license is involved, the operation must be obtained after obtaining a pre-administrative Vacuum equipment and its accessories and consumables, mechanical equipment and its accessories, electronic products and accessories, measuring instruments, lighting products, technical development, technical consultation, sales, on-site maintenance of computer software and hardware; Laboratory supplies, hardware tools, labor insurance Sales of supplies and household appliances; Information technology consulting; E-commerce business (if a pre-administrative license is involved, the operation must be obtained after obtaining a pre-administrative license); Domestic trade; Import and export business.