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【多选题】
在中药活性成分丹皮酚的药代动力学研究中,采用了高效液相色谱内标法测定,中药成分体内分析中,内标物选择的基本要求是( )。A.
其在化学结构上与被测物质相似，但又非原样品中所含有的组分。
B.
两者的保留时间相近，但又能完全分开。
C.
要具有挥发性。
D.
在紫外区具有相同的最大吸收波长。
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