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?
人气：235 ℃ 时间：2020-01-31 11:30:08
解答
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.
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