Road traffic noise reducing devices. test method for determining the acoustic performance. part 3 : normalized traffic noise spectrum.
道路交通噪音减弱装置。声性能测试方法。第3部分：正常交通噪音范围。
Road traffic noise reducing devices. test method for determining the acoustic performance. part 3 : normalized traffic noise spectrum.
道路交通噪音减弱装置。声性能测试方法。第3部分：正常交通噪音范围。
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