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syi commercial trade refers to economic activities that specialize in purchasing, transporting, storing, and selling goods commercial trade is a manifestation of commodity exchange, serving as a bridge between industry and agriculture, cities and rural areas, and production and consumption a fan is a mechanical device that relies on input mechanical energy to increase gas pressure and discharge gas. if you have special requirements, please contact our customer service to place an order..it is a driven fluid machinery fan is a commonly used abbreviation in china for gas compression and gas conveying machinery multiple products to choose from.