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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
noise reduction, NR
The difference in decibels between the average sound pressure levels produced in two rooms by a sound source in one of them.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
The country code for Nauru.
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