Design, manufacture, sales, maintenance, and technical services of environmental protection equipment and sanitation machinery; design, manufacture, sales, maintenance, and technical services of special-purpose vehicles, sanitation vehicles, and special vehicles; environmental engineering design and construction; urban domestic waste operational sweeping, collection, transportation, and treatment services; landscaping engineering construction; road cleaning; river cleaning; exterior wall cleaning (excluding高空作业); pipeline dredging; public toilet cleaning; housekeeping services; real estate agency; property management services; cold working sheet metal fabrication; automotive parts processing; special bolts and power fittings production; steel structure and electromechanical equipment installation and technical services; road freight transport; self-operated and agent import and export of various commodities and technologies (except those restricted or prohibited by the state).