下列关于声音的产生和传播的说法中正确的是 A.声音都是靠空气来传播的b.只要物体振动人就能听到声音c.回声是声音被障碍物反射而形成的d Template




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tomski下列关于声音的产生和传播的说法中正确的是 a.声音都是靠空气来传播的b.只要物体振动人就能听到声音c.回声是声音被障碍物反射而形成的d coloring