当要研究的物理量与多个因素有关时都要采取一定措施控制变量.例如要研究�动�擦力大小与压力大小的关系就要多次改变压力大小同时控制接触面的 Template




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tomski当要研究的物理量与多个因素有关时都要采取一定措施控制变量.例如要研究�动�擦力大小与压力大小的关系就要多次改变压力大小同时控制接触面的 coloring