General business items: sales and installation of metal products, guardrails, guardrail boards, and transportation facilities; processing and sales of experimental benches, fume hoods, assembly line equipment, stainless steel products, first-class medical equipment, furniture, apartment beds, desks and chairs, dining tables, guardrail nets, fences, fruit shell boxes, shelves, workbenches, tool cabinets, hardware and electrical appliances, compact racks, office equipment, and daily necessities; import and export of goods and technologies (except for goods and technologies that are restricted and prohibited from being imported and exported by the state).