1如图甲所示用竖直悬挂的泡沫�料球接触�声的音叉时泡沫�料球被弹起这个现象说明声音是由物体振动产生的.2泡沫�料球在实验中的作用 Template




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tomski1如图甲所示用竖直悬挂的泡沫�料球接触�声的音叉时泡沫�料球被弹起这个现象说明声音是由物体振动产生的.2泡沫�料球在实验中的作用 coloring