题目:
TLC检查特殊杂质的具体方法为
A.峰面积归一化法
B.内标法
C.高低浓度对比法
D.Rf值法
E.杂质对照品对照法
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C解析:[听力原文] 17-20 There are a lot of students who dislike studying history. The problem is not necessarily that the subject is boring, it is just hard ...