Research, development, manufacturing, sales, and service of special vehicles and special chassis, new energy vehicles and automotive parts, construction machinery, concrete machinery, and sanitation machinery; Leasing business of construction machinery and concrete machinery; Sales of mechanical parts, electronic products, hardware and electrical appliances; Import and export business of goods and technology; Development and sales of vehicle remote monitoring management software, sanitation operation management software, official law enforcement supervision software, and logistics dispatch management software; Sales of food and drug testing equipment; Manufacturing, sales, and after-sales service of ambulances; Manufacturing, sales, and after-sales service of medical special vehicles and facility equipment; Research, development, manufacturing, sales, and service of Class I, II, and III medical devices; Sales of communication equipment, police equipment, and testing equipment; Computer information system integration