为了探究声音的音调与�率的关系小明设计了几个实验.你认为能够完成这个探究目的是 A.把罩内的空气抽去一些后闹钟的铃声明显减小b.用力吹 Template




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tomski为了探究声音的音调与�率的关系小明设计了几个实验.你认为能够完成这个探究目的是 a.把罩内的空气抽去一些后闹钟的铃声明显减小b.用力吹 coloring