小红利用一把钢尺在课堂上进行了如图所示的实践活动这个实验说明尺伸出桌面的长短会影响音调的高低伸出部分越短尺子振动越 音调越 利用该 Template




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tomski小红利用一把钢尺在课堂上进行了如图所示的实践活动这个实验说明尺伸出桌面的长短会影响音调的高低伸出部分越短尺子振动越 音调越 利用该 coloring