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减噪系数
compr.
noise reduction coefficient
tech.
acoustic reduction coefficient
;
acoustical reduction coefficient
减噪系数
250、500、1000、2000赫吸声系数的平均值
tech.
noise reduction coefficient
减噪
声
系数
tech.
noise reduction coefficient
减噪系数
:
2 phrases
in 2 subjects
Radio
1
Refrigeration
1
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