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ZX-404F6285492023年6月B卷 · 第 20 题
2023年6月B卷 · 原库模块 2 · Q20 原库参考解析
An acceptable noise criterion rating for the background noise in a laundry room is 50. For a noise criterion rating of 50, the equation y = 22(0.997)x-60 + 47 gives the estimated sound pressure level, y, in decibels, as a function of the octave band center frequency, x, in hertz, where x \( \ge \) 60 . Which of the following is the best interpretation of 47 in this context?
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