�们在学习和生活中手指上会粘上许多细菌.假设常洗手可以减�手上的细菌数量.甲乙两个同学设计了一个实验利用盛有灭菌肉汁蛋白质固体培养基的 Template




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tomski�们在学习和生活中手指上会粘上许多细菌.假设常洗手可以减�手上的细菌数量.甲乙两个同学设计了一个实验利用盛有灭菌肉汁蛋白质固体培养基的 coloring