Mechanical and electrical engineering, intelligent automation engineering, painting engineering, workshop purification engineering, ventilation and exhaust engineering, pipeline installation engineering, indoor and outdoor decoration engineering; production, sales, installation, repair and maintenance: general mechanical equipment and accessories, warehousing equipment, air compressor equipment, injection molding equipment, automation equipment, refrigeration equipment, heating equipment, conveying equipment, assembly line equipment, hardware products and accessories; sales: lubricants, engine oils, base oils, coolants, water-based coatings, cleaning supplies (the above items do not include hazardous chemicals).