小强在研究音调跟什么因素有关的实验时选择橡皮筋作为研究材料研究音调和橡皮筋的松紧程度粗细长度的关系在实验时采用控制变量的实验方法经过 Template




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tomski小强在研究音调跟什么因素有关的实验时选择橡皮筋作为研究材料研究音调和橡皮筋的松紧程度粗细长度的关系在实验时采用控制变量的实验方法经过 coloring