分馏;
Fractional distillation of petroleum is carried on in a still.
石油的分馏在蒸馏器内进行.
It can be separated from each other by ordinary fractional distillation.
两者通过普通的分馏彼此分离.
Fractional distillation is a physical method which cannot decompose compounds.
分馏法只属物理方法,不能分解化合物.
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