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Lubricant oil

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The high-speed-train pantograph is a complex structure that consists of different rod-shaped and rectangular surfaces. Flow phenomena around the pantograph are complicated and can cause a large proportion of aerodynamic noise. which is one of the main aerodynamic noise sources of a high-speed train. Therefore. https://thegreensjunglebeautyshops.shop/product-category/lubricant-oil/

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