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liuxilin1215 发表于 2015-11-21 12:44:58

BS EN 50332-1-2013 Sound system equipment: Headphones and earphones associated w

BS EN 50332-1-2013 Sound system equipment: Headphones and earphones associated with personal music players — Maximum sound pressure level measurement methodology Part 1: General method for "one package equipment"

admin 发表于 2015-11-22 11:54:11

谢谢您的分享,金币已奖励!

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