Air filter pressure reducing valve Sales of mechanical equipment, building materials (excluding sand and gravel), steel, hardware products, automotive parts, motorcycle parts, electronic products, plastic products, rubber products, stationery, sports equipment, clothing, shoes and hats, needle textiles, daily chemical products, daily necessities, furniture, and ceramic products; Import and export business of various commodities and technologies through self operation or agency (excluding commodities and technologies restricted or prohibited by the state for import and export). (For projects that require approval by law, business activities can only be carried out after approval by relevant departments)