距某機械 4 公尺處測得噪音為 90 分貝，若另有一噪音量相同之機械併置一起，於原測量處測量噪音量約為多少分貝？(A) 90 (B) 93 (C) 96 (D) 120

問題詳情

47. 距某機械 4 公尺處測得噪音為 90 分貝，若另有一噪音量相同之機械併置一起，於原測量處測量噪音量約為多少分貝？
(A) 90
(B) 93
(C) 96
(D) 120

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