Railway rolling stock parts manufacturing; railway rolling stock parts sales; automotive parts and accessories manufacturing; refrigeration and air conditioning equipment manufacturing; refrigeration and air conditioning equipment sales; high-speed rail equipment and accessories sales; rail transit special equipment, key systems and components sales; rail transit engineering machinery and parts sales; new energy vehicle electrical accessory sales; battery sales; electronic product sales; mechanical and electrical equipment sales; communication equipment sales; wire and cable distribution; mold sales; fastener sales; building materials sales; garment accessories sales; textile products sales; textile, clothing and household goods wholesale; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; information technology consulting services; chemical product sales (excluding licensed chemical products); technology import and export; import and export of goods.