在学习“有趣的声现象 时小明做了以下几个实验�放在钟罩内的闹钟正响铃把钟罩内的空气抽去一部分听到的铃声明显减弱�使正在�声的音叉接触 Template




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tomski在学习“有趣的声现象 时小明做了以下几个实验�放在钟罩内的闹钟正响铃把钟罩内的空气抽去一部分听到的铃声明显减弱�使正在�声的音叉接触 coloring