the secondary composition method 二次合成法
secondary composition teaching and learning 中学作文教学
secondary school composition teaching 中学作文教学
secondary electron composition contrast 二次电子成分衬度
Secondary electron composition contrast image 二次电子成分衬度像
secondary electron composition contrast imaging 二次电子成分衬度像
They also separated out the DNA from the bacteria and analyzed its composition using a technique called high-resolution secondary ion mass spectrometry; the isolated DNA contained arsenic.
然后他们从细菌中提取出dna，利用高解析二次离子质谱技术分析了其中的化学组成，发现DNA中也含有砷。
We can adjust the final pyrolysis product composition by the control of secondary reactions conditions for different processes.
通过控制二次反应的条件，我们就可以控制热解产品的最终组成。
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