单一变量原则 控制其他因素不变只改变其中一个因素观察其对实验结果的影响遵循单一变量原则既便于对实验结果进行�学的分析又增强实验结果的 Template




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tomski单一变量原则 控制其他因素不变只改变其中一个因素观察其对实验结果的影响遵循单一变量原则既便于对实验结果进行�学的分析又增强实验结果的 coloring