ygs67 发表于 2016-8-29 11:52:51

BS EN 16272-2-2012

BS EN 16272-2-2012  Railway applications. Track. Noise barriers and related devices acting on airborne sound propagation. Test method for determining the acoustic performance. Intrinsic characteristics. Airborne sound insulation in the laboratory under diffuse sound field co

admin 发表于 2016-8-29 16:09:03

谢谢您的分享，金币已奖励!
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