It is concluded that the modern concept of inorganic petroleum origin has gradually been formed.
油气无机成因的现代概念已逐渐形成。
The invention relates to a method of regenerating used oils of petroleum origin by means of extraction with aliphatic solvents.
本发明涉及一种通过脂族溶剂萃取将石油源废油再生的方法。
Various theories and suppositions have been proposed about the origin of petroleum hydrocarbons. It is really a hot topic .
有关石油碳氢化合物的起源问题，有着各种各样的理论和推测，可以说是一个热门话题。
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