Engineering and technology research and experimental development; Research and development of environmental protection technology, HVAC equipment, indoor environment and healthy air system equipment and engineering technology; Production of environmental protection equipment, stainless steel kitchen equipment and its products; Manufacturing of fans, fans, refrigeration, air conditioning equipment, urban rail transit equipment, cable bridge, mining machinery, noise and vibration control equipment, energy saving and environmental protection equipment; Distribution switch control equipment manufacturing, sales, research and development; Sales of mechanical and electrical equipment, general mechanical equipment, refrigeration equipment, range hoods, electronic products, kitchen equipment and kitchen supplies, environmental protection equipment, HVAC equipment, ventilation equipment; Sales and manufacturing of fire fighting equipment and equipment; Mechanical and electrical production and processing; General cargo transportation (except freight rental and moving transportation); Dust removal equipment sales, production, installation; Basic software development; Cleaning and maintenance of kitchen equipment; Building air conditioning equipment, ventilation equipment system installation services; Mechanical and electrical equipment processing; Import and export of all kinds of commodities and technologies on its own or as agents, except those commodities and technologies whose import and export are restricted or prohibited by the State; Software technical services; Development and construction of e-commerce platform. (For projects subject to approval according to law, business activities can only be carried out after approval by relevant departments)