小明做了下面两个实验敲击鼓面鼓面上纸�上下跳动说话时用手�喉咙感觉声带在振动.以上现象说明 A声音是由物体的振动产生的b声音 Template




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tomski小明做了下面两个实验敲击鼓面鼓面上纸�上下跳动说话时用手�喉咙感觉声带在振动.以上现象说明 a声音是由物体的振动产生的b声音 coloring