下面三幅图片是有关声现象的四个实验图1如图甲所示当瓶中空气不继被抽出时可听到振铃声 由此推理可知 .2如图乙所示敲鼓时用力 Template




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tomski下面三幅图片是有关声现象的四个实验图1如图甲所示当瓶中空气不继被抽出时可听到振铃声 由此推理可知 .2如图乙所示敲鼓时用力 coloring