下列有关实验设计的叙述中不正确的是 A.实验材料的数量温度和时间都可能是实验的变量 b.各种实验中都必须设置空白对照组确保单一变量 c Template




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tomski下列有关实验设计的叙述中不正确的是 a.实验材料的数量温度和时间都可能是实验的变量 b.各种实验中都必须设置空白对照组确保单一变量 coloring