主营：Oxygen production equipment, testing instruments [without metering devices], electronics, domestic appliances, air purification units, air conditioning, development and production of high-voltage power sources and ancillary products, development and techn
主营：Materials science research, technology development, wholesale of electrical equipment, repair of specialized equipment, repair of daily electrical appliances, installation services for building air conditioning equipment, ventilation equipment systems, re
主营：Research and development of new energy products, technical consulting, technology transfer, sales, installation, and maintenance of new energy products, energy-saving products, air conditioning, solar energy, heat pump units, boilers, fresh air systems, v
主营：Laboratory system engineering design and planning, clean systems, self-control and constant temperature and humidity systems, pure water and waste gas treatment systems, air purification systems, gas pipeline systems design, development and technical serv
主营：Wholesale, import and export of food circulation, medical equipment, laboratory reagents, laboratory equipment, environmental protection equipment, water treatment equipment, air conditioning, instruments and meters, fitness equipment, cosmetics, electron
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