Manufacturing, processing, and self-sales of special vehicles, automobiles, automobile chassis, trailers, automobile assemblies, diesel engines, gasoline engines, electric vehicles, railway freight cars, aircraft parts, motors, electrical appliances, instruments, electronic products, mechanical equipment and parts, industrial special equipment, castings and forgings, metal materials and their products, metal structures and their components, tools, rubber products, plastic products, inorganic chemicals (excluding hazardous chemicals), carbon products, and building materials; steel smelting and steel rolling; production and supply of electric power; construction engineering survey, design, and construction (Class C); leasing; scientific research, design, development, technical consulting, and technical services related to the main business. Enterprises independently choose business projects according to law and carry out business activities; projects subject to approval according to law shall carry out business activities after approval by relevant departments; shall not engage in projects prohibited or restricted by the city’s industrial policies.