Business scope includes: General items: Technical service, technology development, technical consultation, technical exchange, technology transfer, technology promotion; General mechanical equipment installation services; Special equipment repair; Information consulting services (excluding licensed information consulting services); Professional cleaning, cleaning, disinfection services; Sales of diving rescue equipment; Sales of labor protection products; Fire equipment sales; Intelligent instrument sales; General merchandise sales; Electrical equipment sales; Electrical instrument sales; Hardware products wholesale; Machinery and equipment sales; Enterprise management; Stationery retail; Stationery wholesale; Office supplies sales; Retail of computer hardware, software and auxiliary equipment; Metal structure sales; Hydraulic power machinery and components sales; Security equipment sales; General equipment repair