R&D, manufacturing, sales and maintenance: railway transportation equipment (relevant administrative licenses or approvals must be obtained before operating), maintenance equipment (relevant administrative licenses or approvals must be obtained before operating), testing equipment (relevant administrative licenses or approvals must be obtained before operating), electrical equipment, urban rail transit equipment (relevant administrative licenses or approvals must be obtained before operating), road safety testing equipment (relevant administrative licenses or approvals must be obtained before operating), welding equipment, generator sets ( Relevant administrative licenses or approvals must be obtained before business can be carried out), power transmission equipment (relevant administrative licenses or approvals must be obtained before business can be carried out), lubrication equipment, hydraulic and pneumatic machinery and components, bearings, gears and transmission parts, general equipment and parts, communication equipment (excluding radio transmitting and ground receiving equipment), electronic products (excluding electronic publications), mechanical and electrical products and household appliances, automation equipment, intelligent machine equipment and intelligent robots and accessories; lubricating greases and oils (excluding hazardous chemicals), welding Research and development, manufacturing and sales of strips and fluxes; provision of welding construction business; technology development, transfer, leasing, consulting and services of railway facilities (relevant administrative licenses or approvals must be obtained before operating), urban rail transit facilities and equipment (relevant administrative licenses or approvals must be obtained before operating); manufacturing and sales: general machinery, electrical machinery, special equipment, molds, automobile and motorcycle accessories, hardware tools, printed circuit boards, electroplating parts (not directly engaged in electroplating operations), die castings, plastic pressing parts; sales Sales: steel, building materials (excluding hazardous chemicals), metal materials, office supplies, daily necessities, clothing; rail inspection (relevant administrative licenses or approvals must be obtained before engaging in business); software development; system integration; electromechanical, communication and information technology consulting; corporate management consulting; technical consulting and technical services for polishing, testing, flaw detection, and welding of urban rail transit and railway tracks and lines (relevant administrative licenses or approvals must be obtained before engaging in business); engaged in the import and export business of goods and technology. (The above scope shall not be operated if it is prohibited by national laws and regulations; it shall be subject to examination and approval according to national laws and regulations, but shall not be operated before approval is obtained)*