Manufacturing, processing, and selling of chemical equipment, petrochemical equipment, environmental protection equipment, heating, ventilation, and air conditioning equipment, metal structural parts, and hardware; manufacturing and processing of mechanical equipment; sales of metal materials, general-purpose machinery and equipment, and chemical products (excluding hazardous chemicals); self-operated and agency import and export business of various commodities and technologies (except for those commodities and technologies that are restricted or prohibited from import and export by the state); site leasing. (Operate as required by laws and regulations; subject to approval by relevant departments of the people's government.)