关于声现象的说法中正确的是 A.�声的物体一定在振动振动停止后声音不会立即消失b.物体�出声音后必须靠空气才能传播c.�们拍墙能 Template




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tomski关于声现象的说法中正确的是 a.�声的物体一定在振动振动停止后声音不会立即消失b.物体�出声音后必须靠空气才能传播c.�们拍墙能 coloring