题目内容

薄层色谱属于

A. 液固色谱
B. 气固色谱
C. 液液色谱
D. 气液色谱

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用薄层色谱法对待测组分定性时,主要依据

A. 比移值Rf
B. 斑点的大小
C. 斑点的颜色
D. 斑点至原点的距离

测定运动饮料中VC含量时,加入草酸溶液的作用是。

Which type do the six letters belong to?

A. Formal letter
B. Informal letter

Gather information of the writers of the letters and their daughter.(填写对应序号)1.Father's name:2.Father's occupation:3.Father's location:4.Mother's name:5.Mother's occupation:6.Mother's location:7.Time for father and mother to writer and read the letters:8.Daughter's name:9.Daughter's occupation:10.Daughter's location:11.Time for daughter to writer and read the letters:

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