Manufacturing and sales of airport (airport) equipment, electromechanical equipment, environmental protection purification equipment, vending machines, metal building components, mold sheet metal processing, experimental analysis instruments; household appliances and spare parts, motorcycles, electric bicycles, automobile and motorcycle accessories, bicycle motors, vehicle power batteries, Sales of water heaters, water boilers, water purification equipment, thermostatic cabinets, department stores, daily necessities, clothing, shoes and hats, knitted textiles, wood, and hardware; food business; engaged in the import and export of goods and technology import and export, except for goods and technologies that are restricted by the state or prohibited from being imported and exported.