On-site maintenance, on-site installation: Air conditioning, mechanical and electrical equipment, refrigeration equipment (excluding special equipment): Wholesale: Household electricity, refrigeration equipment and accessories, air conditioning, electronic products, hardware accessories, rubber and plastic products (excluding disposable foamable plastic products and ultra-thin plastic bags), lubricating oil, insulation materials, hardware and electrical, chemical products (excluding dangerous goods): Goods and technology import and export (excluding publication) Import of goods). (Business activities can only be carried out after the approval of the relevant departments of the project subject to approval according to law)