WebThe sound absorption average (SAA) is defined as a single number rating, the average, rounded to the nearest 0.01, ... inclusive. The noise reduction coefficient (NRC) is defined from previous versions of this same test method as the average of the coefficients at 250, 500, 1000, and 2000 Hz, expressed to the nearest integral multiple of 0.05. Web9 apr. 2024 · To evaluate in possible use of phytases for improving the utilization of low protein and energy diets, 420, one-day-old chicks were distributed among 7 groups (5 replicates of 12 chicks/group). During the starter (1–35 day), grower (37–56 day), and finisher (57–64 day) periods, the control group fed diets containing 21.2% crude protein …

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WebNoise reduction coefficient, or NRC, is a rating used to measure how effective a material is at absorbing sound. NRC ratings are calculated by taking the arithmetic averages of a … WebNRC（降噪系数）是一个平均值，在250HZ、500HZ、1000HZ、2000HZ四个倍频带吸声系数的平均值。. 你的问题没有办法回答，需要拿专门仪器测量后才会有结果。. 所作方案 … premier automotive group milford oh 45150

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