Unverified85% confidenceFactTime unknown

NRR和SNR不能直接换算，欧标SNR通常比美标NRR高约3-6dB，跨标准比较时应统一换算：实际有效衰减≈(NRR-7)/2

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UnverifiedNRR和SNR是两套标准，SNR（欧标）通常比NRR（美标）数值高3-4，SNR37约等于NRR33，跨标准对比时需换算89% similar Unverified选购看NRR还是SNR：欧标SNR值通常比美标NRR高约3dB，同款产品若标NRR 33则大致对应SNR 36，跨标准比较时不能直接对比数字86% similar

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