Beijing leung chang technology ltd. Is registered on the second floor of 550 east street, 51st street, beijing gate cane district, with the registration authority zhang jie as the market supervisory authority of beijing gate cane district, representing zhang jie; software development; basic software services; rental of mechanical equipment; cleaning services for the outer wall of the building; subcontracting of labour; sale of steel, metal materials, construction materials, decoration materials, hardware, hardware (without electric bicycles), electronics products, machinery and equipment, electrical equipment, vehicles, car parts, computer hardware and hardware and externals, communications equipment (except for satellite receiving equipment), furniture, lamps, daily supplies, sports supplies, cultural supplies; general contracting for construction; and professional contracting. (an enterprise shall, in accordance with the law, freely choose to operate its projects and carry out its activities; it shall carry out its activities on the basis of the approved content of the projects, subject to the approval of the relevant sector; and it shall not engage in activities which are prohibited or restricted by the municipal industrial policy