如图所示用钢尺做探究实验保持钢尺伸出桌边的长度不变一次轻拨钢尺另一次用力拨动听声音的不同.实验�现用力拨钢尺钢尺振动的幅度越大 Template




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tomski如图所示用钢尺做探究实验保持钢尺伸出桌边的长度不变一次轻拨钢尺另一次用力拨动听声音的不同.实验�现用力拨钢尺钢尺振动的幅度越大 coloring