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单项选择题

用失去部分结晶水的HCO.2HO基准物质标定NaOH的浓度是,所得的NaOH溶液的浓度与真实的浓度相比  (    )     A. 偏高;        B. 偏低;          C. 不影响;            D. 无法确定

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