A systematic study is made of regular transformation.
作者对规范变换进行了较为系统的研究。
A relatively systematic study is made of the effect of such impurities as compressor oil, nitric acid and chlorides on the thermal decomposition properties of ammonium nitrate (an) solution.
就压缩机油、硝酸、氯化物等杂质对硝酸铵(AN)溶液热分解特性的影响进行了较为系统的研究。
Marx and others had ever made systematic study on credit from the economics point of view, and pointed out that credit is a special form of value movement based on repayment.
马克思、恩格斯则对经济学上的信用作过系统研究，指出信用是以偿还为条件的价值运动的特殊形式。
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