Unverified78% confidenceFactTime unknown
隔音材料的隔声性能用STC（隔声等级）或Rw衡量，家用有效改善通常需要材料贡献STC提升10以上；宣传只标注'降噪XXdB'而无STC/频率曲线的产品参数不可信
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78%
Confidence
Long-term
Relevance
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