By controlling reaction condition in different steps and hydrogenated with Raney Ni,most of components were converted into industrial grade p-menthane without purification.
实施分阶段控制反应条件,用雷尼镍催化,使大多数组分均

对孟烷,无需提纯,即达
工业级的要求。
声明:以上例句、词性分类均由互联网资源自动生成,部分未经过人工审核,其表达内容亦不代表本软件的观点;若发现问题,欢迎向我们指正。
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集 This is The English We Speak from BBC Learning English, and we're talking about the expression 'one step at a time' - it means to improve something gradually, it means to improve something gradually, in stages - step by step.
这是BBC《地道英语》节目,我们正在学习" one step at a time" ,这意味着逐步改进,意思是逐步改进,分
,一步一步来。
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CNN 10 学生英语 2020
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