下列关于声现象的说法中正确的是a声音是由于物体振动产生的b声音在不同介质中的传播速度相同c声音在真空中的传播速度为340msd为了使 Template




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tomski下列关于声现象的说法中正确的是a声音是由于物体振动产生的b声音在不同介质中的传播速度相同c声音在真空中的传播速度为340msd为了使 coloring