Sales of construction engineering machinery; sales of mining machinery; sales of hand carts and animal-drawn vehicles; sales of hydraulic power machinery and components; sales of mechanical equipment; installation services for general mechanical equipment; sales of construction metal accessories; sales of building materials; sales of electrical equipment; wholesale of hardware products; sales of metal products; sales of electronic products; sales of daily necessities; sales of office equipment; sales of office supplies; sales of automotive decoration products; wholesale of automotive parts; sales of general merchandise; automotive towing, rescue, and obstacle removal services; sales of used goods; sales of automobiles; used car brokerage; used car trading market operations.