fraction n. 1.小部分,碎片,片断。 2.一些,一点儿。 3.【化学】分馏,分层,分级。 4.【宗教】圣餐面包分切式。 5.【数学】分数。 a common [vulgar] fraction 普通分数。 a compound [complex] fraction 繁分数。 a mixed fraction 带分数。 a decimal fraction 小数。 a proper [improper] fraction 真[假]分数。 a fraction closer 稍微靠近一点。 by fractions 有余数的,不完全的。 crumble into fractions 碎成片片。 in a fraction of a second 一秒钟的若干分之几,一转眼的工夫。 not a fraction of 一点也没有。 not by a fraction 一点也不。 to a fraction 〔口语〕道道地地,百分之百地。
It is a light fraction of petroleum . it can be used as solvent of insecticide aerosol , medicine and dyeing 本产品为由石油的轻质馏分,经深度加氢精制所制得的hr - 92杀虫气雾剂用油。
However , the majority of crude oils , and this applies to the heavier , more viscous petroleums , which are processed by distillation , are usually separated into the lighter fractions ( gas , gasoline , naphtha , kerosene , and gas oil ) and the bottom or , as it is more generally called , the reduced crude 但是,经过蒸馏处理的大多数原油,包括比重较大、粘度更大的原油,一般都分离为较轻组分(气、汽油、粗汽油、煤油和粗柴油)和残渣,或者更多称作常压重油。