Research, development, production, sales, repair, leasing, technical consulting, and technology transfer of vehicles, mechanical equipment, sanitation equipment, cleaning equipment, snow removal equipment, and accessories; research, development, manufacturing, and sales of brush products and related materials; sales of lubricating oil; property management; environmental sanitation management; urban and rural appearance management; greening management; municipal facility management services; water pollution control; collection, cleaning, transportation, and treatment of urban and rural domestic waste; building cleaning services; sewage treatment services; ordinary road freight transport; computer software and hardware development and sales; internet information services; self-operated and agency import and export of various goods and technologies, except for goods and technologies restricted or prohibited by the state.