题目内容

下列关于体内药物分析描述错误的是

A. 是研究生物机体中药物及其代谢物和内源性物质的质与量变化规律的分析方法学
B. 测定的对象是生物样品
C. 常用的生物样品是血液、尿液和唾液
D. 尿液的pH值在6．2—7．6之间
E. 采集的尿是自然排尿

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