Report - 고속철도소음 특성 - webbook.me.go.krwebbook.me.go.kr/DLi-File/NIER/06/56188.pdf · m로 멀어질 때 최고소음도(Lmax)는 각각 4.6, 5.2 dB씩 감소하고, 높이 29.5

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