General items: Sales of construction machinery; Sales of mechanical and electrical equipment; Wholesale of auto parts; Wholesale of motorcycles and spare parts; Sales of refrigeration and air conditioning equipment; Camera and equipment sales; Sales of building materials; Sales of office supplies; Sales of seals; Wholesale of hardware products; Technical services, technical development, technical consultation, technical exchange, technology transfer and technology promotion; General mechanical equipment installation services. (except for projects subject to approval according to law, business activities shall be carried out independently according to law with business license) licensed projects: Construction projects. (for projects that must be approved according to law, business activities can be carried out only after being approved by the relevant departments. The specific business projects shall be subject to the approval documents or licenses of the relevant departments. )