Manufacturing of conveyor belts; wholesale and retail of conveyor machinery, rubber machinery, mining machinery and accessories (except those that require special approval according to laws and regulations), chemical raw materials (except for those that require special approval according to laws and regulations), rubber, textiles, building materials, textile raw materials, thermal insulation refractory materials, electrical appliances, steel, Wujinjiaodian, motorcycles, automobiles (excluding cars); import and export of the above goods, and technology import and export. (Except where prohibited by the state)