Additives for oil products, refinery aids, oilfield drilling and production aids, industrial circulating water treatment aids, cement additives, concrete admixtures, daily use disinfectants, water-based paints, coatings, petrochemical raw materials (excluding flammable and explosive hazardous chemicals), pharmaceutical intermediates, chemical intermediates, lubricants, paraffin and other petroleum products, research, development, production, processing, sales and technical services of intelligent mechanical equipment (excluding flammable and explosive hazardous chemicals); Oil and gas engineering technical services (well repair, fracturing), sales and installation of sewage treatment equipment; Import and export of goods and technology (excluding goods and technology restricted or prohibited by the state); General cargo warehousing; Rental of houses; Rental of venues. (Projects that require approval by law can only be carried out after approval by relevant departments)