Manufacturing and sales of automobile maintenance equipment, hydraulic power machinery, welding equipment, spray paint equipment, coating equipment, industrial coating lines, environmental protection equipment, paint mist treatment equipment, exhaust gas and wastewater treatment equipment, gas purification equipment and consumables, ventilation equipment and pipelines, agricultural machinery, industrial automatic control system devices, sales of automobile testing equipment, metal processing equipment, air supply equipment, fans, and drying equipment Equipment, heating equipment, fire-fighting equipment and equipment, valves and pipe fittings, hardware and electrical machinery, tools, wires and cables, electrical machinery, metal materials, electronic products (excluding electronic publications), new building materials (excluding hazardous chemicals), chemical products (excluding hazardous chemicals and Class I precursor drugs), labor protection supplies, auto parts, motorcycle accessories, instruments and meters, teaching equipment and accessories and consumables.