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【单选题】
肿瘤的生长分数是指（）。A.
肿瘤细胞群体中处于复制阶段（S+G期）的细胞比例
B.
肿瘤细胞群体中处于合成前期（G期）的细胞比例
C.
肿瘤细胞群体中处于有丝分裂期（M期）的细胞比例
D.
肿瘤细胞群体中处于合成前后期（G+G期）的细胞比例
E.
肿瘤细胞群体中处于合成期（S期）的细胞比例
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