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2.下图表示用胸苷(TdR)双阻断法使细胞周期同步化,其中甲表示正常的细胞周期 G_1 、S、G2、M期依次分别为10h、7h、3.5h1.5h;乙表示经第一次阻断,细胞都停留在S期;丙表示洗去TdR恢复正常的细胞周期;丁表示经第二次阻断,细胞均停留在 G_1/S交界处。下列说法正确的是SSSSGGGGG2G2G2G2MMMM甲丙丁A.实验...