三个相同的水瓶中灌入不同量的水水位由高到低如图所示用筷子敲击它们 振动�声且可以�出音调不同的声音 瓶子�出的声音音调最低 瓶子 Template




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tomski三个相同的水瓶中灌入不同量的水水位由高到低如图所示用筷子敲击它们 振动�声且可以�出音调不同的声音 瓶子�出的声音音调最低 coloring