ygs67 发表于 2016-8-29 11:45:46

BS EN 16272-1-2012

BS EN 16272-1-2012 Railway applications. Track. Noise barriers and related devices acting on airborne sound propagation. Test method for determining the acoustic performance. Intrinsic characteristics. Sound absorption in the laboratory under diffuse sound field conditions

admin 发表于 2016-8-29 16:09:00

谢谢您的分享，金币已奖励!
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