Design, R&D, production, sales, and maintenance: highway maintenance machinery, garden machinery, agricultural and forestry machinery, small general-purpose machinery, electric sanitation vehicles, sweepers, road marking equipment, snow removal equipment, environmental protection equipment, monitoring equipment, specialized tools, electromechanical equipment; installation and construction of traffic facilities; construction and installation of highway signs and road markings; sprinkler irrigation construction; modification of special vehicles; import and export business (excluding those requiring approval or prohibited by national laws and regulations); sales: engineering machinery, engineering vehicles, special vehicles, police equipment (operating within the approved scope per valid approval documents from the provincial public security department), fire-fighting equipment, lubricants, instruments and meters, quarantine equipment, sanitation equipment, leasing of mechanical equipment, landfill leachate treatment equipment, biogas treatment equipment; environmental protection materials, recycled environmental products; development and promotion of environmental protection technologies and application technical services, technical consulting services; water pollution control, air pollution control, solid waste treatment (excluding hazardous substances); urban and rural waste classification, sweeping, collection, transportation, and treatment services (excluding medical waste or toxic and hazardous waste); resource utilization of kitchen waste; comprehensive utilization of construction waste; road waste treatment and comprehensive utilization; recycling of renewable resources (excluding solid waste, hazardous waste, scrap vehicles, and other items requiring approval from relevant departments).