Electric power technology research and development (except projects involving special national approval); electric power engineering construction; high and low voltage electric power equipment, high and low voltage electrical components, power transformers, high voltage metering boxes, high and low voltage transformers, electronic components, mechanical equipment, instrumentation, welding and cutting equipment, hardware tools, refrigeration equipment, communication equipment, plastic parts, lamps and lanterns, wires and cables, fire-fighting equipment, auto parts, motorcycle parts, household appliances, furniture manufacturing, processing, sales Sales of mechanical and electrical products, daily necessities, sporting goods, outdoor supplies, teaching equipment, office supplies, Class I medical equipment, Class II medical equipment, pharmaceuticals, metal materials, chemical raw materials (excluding hazardous chemicals and precursor chemicals), building materials, and textiles; sales and installation of mobile homes; import and export of goods or technology (except for goods and technology import and export prohibited by the state or involving administrative approval); electrical equipment leasing; property management; and enterprise management services.