pndb
abbr. 可闻噪声分贝(Perceived Noise decibels)
perceived noise decibel(s) 感觉(或可闻)噪声分贝
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abbr. 可闻噪声分贝(Perceived Noise decibels)
perceived noise decibel(s) 感觉(或可闻)噪声分贝
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