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当前学科：输血技术(医学高级)
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欲比较血红蛋白与空腹血糖值这两组数据的变异程度，宜采用（）。
A . 方差（S2）
B . 极差（R）
C . 标准差（S）
D . 变异系数（CV）
E . 四分位间距
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