Reverberation time, or RT60, is a metric which describes the length of time take

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试卷: WELL AP模拟题英文B卷[查看]
Reverberation time, or RT60, is a metric which describes the length of time taken for a sound to decay by what from its original level? 混响时间（或RT60）是一个度量标准，它描述声音从原始水平衰减的时间长度？
A: by 45 dB 45分贝
B: by 55 dB 55分贝
C: by 30 dB 30分贝
D: by 60 dB 60分贝

参考答案: D

本题解释:
正确答案：D