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15．现代的城市把控制噪声列为环境保护的重要项目之一．如图所示甲乙分别是从声源处和传播过程中减弱噪声．如图丙所示在繁华闹市区设立的噪声 Template






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tomski15．现代的城市把控制噪声列为环境保护的重要项目之一．如图所示甲乙分别是从声源处和传播过程中减弱噪声．如图丙所示在繁华闹市区设立的噪声 coloring
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