General: Sales of building materials; Mold sales; Building waterproof coil products sales; Sales of chemical products (excluding licensed chemical products); Sales of Category I medical devices; General merchandise sales; The second category of medical device sales; Office supplies sales; Office equipment consumables sales; Import and export of goods; Technology import and export; Import and export agent (except for items subject to approval according to law, independent business activities shall be carried out by business license according to law) License matters: Hazardous chemical business (items subject to approval according to law, business activities shall be carried out only after approval by relevant departments, specific business projects shall be subject to approval documents or license certificates of relevant departments)