Sales and maintenance of general machinery and accessories, electronic products and accessories, firefighting equipment and accessories, metal materials, packaging materials, fixtures, office supplies, chemical products and raw materials (excluding hazardous materials), and daily necessities; Design, construction, installation, and maintenance of fire protection engineering; Installation and maintenance of security equipment; Warehousing services; Self-operated and agency import and export of various goods and technologies (excluding goods and technologies subject to state restrictions or prohibitions). (Projects subject to approval by law may only commence operations after obtaining relevant departmental approval. ) General projects: Machinery and equipment R&D; Valve and plug R&D; Sales of industrial automatic control system devices; Sales of machinery and equipment; Sales of valves and plugs; Sales of Class I medical devices; Sales of Class II medical devices; Manufacturing of industrial automatic control system devices; Manufacturing of specialized equipment (excluding licensed professional equipment manufacturing); Manufacturing of general valves and plugs (excluding special equipment manufacturing); R&D of emerging energy technologies; Sales of new energy primary equipment; Manufacturing of new energy primary equipment; Sales of batteries; Manufacturing of power distribution switch control equipment; Sales of power distribution switch control equipment; Energy storage technical services; Solar power generation technical services; Sales of solar thermal power generation equipment; Manufacturing of photovoltaic equipment and components; Sales of photovoltaic equipment and components; Leasing of photovoltaic power generation equipment; Technology intermediary services; Manufacturing of computer software and hardware and peripheral equipment; Retail of computer software and hardware and auxiliary equipment; Sales of charging piles; Sales of motor vehicle charging services; Sales of smart power transmission, distribution, and control equipment; Sales of electronic products; Sales of electrical accessories; Manufacturing of power transmission, distribution, and control equipment; Sales of optoelectronic devices; Technical services, technical development, technical consulting, technical exchange, technical transfer, and technical promotion; Import and export of goods; Import and export of technology; Import and export agency (except for projects subject to approval by law, operations may commence independently with a business license in accordance with the law)