Research, development, production, and sales of engineering machinery, construction machinery, complete sets of hoisting machinery, complete sets of mining machinery, metal structure products, and related accessories; research, development, and sales of motor vehicles (excluding cars); production of chemical machinery and equipment; quality inspection technical services; installation, commissioning, and repair of self-produced complete sets of equipment; metal structure installation engineering; leasing of engineering machinery; repair of engineering machinery; purchase and sales of raw materials, auxiliary materials, and equipment; sales of paint and thinners (excluding controlled chemicals such as precursor chemicals, hazardous chemicals, and monitoring chemicals); export business of self-produced products; import and export business of machinery, equipment, parts, and raw materials required by the enterprise (excluding those restricted or prohibited by the state).