在探究“什么因素决定音调的高低 时如图所示将钢尺的一端紧压在桌面上另一端伸出桌面拨动钢尺使之振动听钢尺振动�出的声音.1实验时 Template




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tomski在探究“什么因素决定音调的高低 时如图所示将钢尺的一端紧压在桌面上另一端伸出桌面拨动钢尺使之振动听钢尺振动�出的声音.1实验时 coloring