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ASTM
ASTM C423-99a
Заменен
Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
— 13 стр.
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— 13 стр.
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ASTM C423-00
Заменен
Standard Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
— 13 стр.