Report - About MQA (Master Quality Authenticated)...MQA System end-to-end MQA 0 MQA 15 Air with distance (metres) 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25 Figure 2. 空気中（湿度30%)を数メートル伝播する音とMQA

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