7.下列关于声现象的说法正确的是 A.声波在真空中传播速度最大b.住宅安装双层玻璃窗可以减小室外噪声对室内的影响c.“听诊器 能使人的心脏 Template




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tomski7.下列关于声现象的说法正确的是 a.声波在真空中传播速度最大b.住宅安装双层玻璃窗可以减小室外噪声对室内的影响c.“听诊器 能使人的心脏 coloring