R&D, manufacturing, processing and sales of handicrafts (except ivory and their products), toys, motorcycle mufflers, electrical appliances, hardware tools, electronic components, instruments, LED light sources, optical lenses, steel molds, plastic molds, TV brackets, TV cabinets, and electric curtains; plastic spray processing; metal materials, non-ferrous metal raw materials, precious metal raw materials, chemical raw materials and products (except hazardous chemicals ), sales of construction and decoration materials, knitted textiles, leather products, plastic products, ceramic products, metal products, furniture, and sanitary ware; self-operated or agency import and export of goods and technologies, except for goods and technologies that are restricted by the state or prohibited from import and export, and other items that are not prohibited or do not require a business license according to laws, regulations, decisions of the State Council, etc., and items that are not included in the negative list for local industrial development.