Investment consultation; sales of aluminum-plastic steel doors and windows, daily necessities, building materials, metal materials (except precious metals), Wujinjiaodian, mechanical and electrical equipment, instruments and meters, household appliances, automobile and motorcycle accessories, communication equipment, computers, stationery, rubber and plastic products, cosmetics, textiles, clothing, shoes and hats, leather Products, arts and crafts (except gold and silver jewelry), watches and glasses, seedlings, flowers, glass; engaged in foreign trade operations for the import and export of goods and technology (unless otherwise provided by laws and administrative regulations); production, processing, installation of aluminum-plastic steel doors and windows, electric welding, cold work processing; professional contracting of metal door and window projects. (If administrative licensing is involved, the business shall be operated with a license). [Projects that require approval according to law can only be carried out with approval from relevant departments]