肺炎双球菌有s型和r型两种二者在细胞结构上既有相同之处又有显�的差别引起二者显�差异的根本原因是a细胞的分化bdna的不同c Template




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tomski肺炎双球菌有s型和r型两种二者在细胞结构上既有相同之处又有显�的差别引起二者显�差异的根本原因是a细胞的分化bdna的不同c coloring