Installation and maintenance of mechanical and electrical equipment (except special ones), development of robot systems, various production line equipment, painting equipment, logistics equipment, purification and air-conditioning system equipment, building materials, metal materials, Wujinjiaodian, wholesale and retail of knitted textiles, daily necessities, communication equipment, import and export of goods and technology, technology development, technical consultation, technology transfer, and technical services in the field of electromechanical equipment and mechanical equipment.