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【单选题】
患者，男性，73岁。患前列腺炎。医嘱留取12小时尿做尿爱迪计数检验。护士在尿标本中添加甲醛防腐剂的作用是( )A.
防止尿液变颜色
B.
保持尿液的化学成分不变
C.
固定尿中有机成分
D.
防止尿中激素被氧化
E.
避免尿液被污染变质
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