4.在动物实验中正确设置对照组不容易.例如要选择30个完全相似的动物将其均分为对照组和实验组就比较困难.那么进行这种实验时你认为 Template




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tomski4.在动物实验中正确设置对照组不容易.例如要选择30个完全相似的动物将其均分为对照组和实验组就比较困难.那么进行这种实验时你认为 coloring