the largest portal website for air conditioning, cooling, heating and ventilation industry, provides services such as engineering, products, technical information download, energy conservation and emission reduction, teaching and research, expert q&a, hot discussion, latest industry information, corporate brand promotion, talent recruitment and product marketing promotion, etc., dedicated to create a professional network information service platform for information dissemination, technical exchange and management and marketing in the hvac industry
folding box air conditioning and refrigeration network, hvac refrigeration technology, hvac technology, hvac refrigeration industry portal 1 yancheng baekyan family 30 people