Unverified85% confidenceDecision RuleTime unknown
NRR值需换算实际隔音效果：实际衰减≈(NRR-7)÷2 dB。NRR33的耳塞实际约降噪13dB，睡眠打鼾（约60-90dB）需要NRR≥30，飞机客舱（约85dB）NRR≥25即可
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