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英文请翻译一下啊啊啊..

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/07/14 14:57:25
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?
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.