英文请翻译一下啊啊啊..Mass spectrometry and chromatography are widely used instrumental techniques in chemistry.问题是,What are the main principles on which each of these techniques is based.这里的each是要回答Mass spectrometry还

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英文请翻译一下啊啊啊..Mass spectrometry and chromatography are widely used instrumental techniques in chemistry.问题是,What are the main principles on which each of these techniques is based.这里的each是要回答Mass spectrometry还

英文请翻译一下啊啊啊..Mass spectrometry and chromatography are widely used instrumental techniques in chemistry.问题是,What are the main principles on which each of these techniques is based.这里的each是要回答Mass spectrometry还
英文请翻译一下啊啊啊..
Mass spectrometry and chromatography are widely used instrumental techniques in chemistry.
问题是,
What are the main principles on which each of these techniques is based.
这里的each是要回答Mass spectrometry还是 chromatography还是随便选1个?

英文请翻译一下啊啊啊..Mass spectrometry and chromatography are widely used instrumental techniques in chemistry.问题是,What are the main principles on which each of these techniques is based.这里的each是要回答Mass spectrometry还
1.不是共同点,也不是选一个.
是每个都要解释.
其实问题就是:
Mass spectrometry is based on what principle
Chromatography is based on what principle
2.回jessica,这句话没问题.

质谱和色谱是在化学中被广泛应用的实验技术.
问题:
这些技术所依据的主要理论基础是什么.
不是两个中的一个,而是问这两种方法的共同点

我觉得是MS和chromatography都要
但是句子挺奇怪的，要么是把are去掉，要么是变成 Mass spectrometry and chromatography are widely used IN instrumental techniques in chemistry.

两个都要呀~~~each is like each one, and 1+1=2...
o.O

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