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当前学科：临床化学检验
题目：
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如果患者血清BUN11.6mmol／L，Cr225μmol／L，提示患者肾功能处于（）
A . 肾贮备能力丧失期
B . 氮质血症期
C . 肾衰竭期
D . 尿毒症期
E . 肾功能正常
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