探究声音能否在真空中传播实验时在玻璃瓶中安装一只电铃用真空泵逐渐�外抽气�现电铃的声音不断减小再通过推理和抽象总结出声音不能在真空中 Template




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tomski探究声音能否在真空中传播实验时在玻璃瓶中安装一只电铃用真空泵逐渐�外抽气�现电铃的声音不断减小再通过推理和抽象总结出声音不能在真空中 coloring