fraction n. 1.小部分,碎片,片斷。 2.一些,一點兒。 3.【化學】分餾,分層,分級。 4.【宗教】圣餐面包分切式。 5.【數學】分數。 a common [vulgar] fraction 普通分數。 a compound [complex] fraction 繁分數。 a mixed fraction 帶分數。 a decimal fraction 小數。 a proper [improper] fraction 真[假]分數。 a fraction closer 稍微靠近一點。 by fractions 有余數的,不完全的。 crumble into fractions 碎成片片。 in a fraction of a second 一秒鐘的若干分之幾,一轉眼的工夫。 not a fraction of 一點也沒有。 not by a fraction 一點也不。 to a fraction 〔口語〕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 本產品為由石油的輕質餾分,經深度加氫精制所制得的hr - 92殺蟲氣霧劑用油。
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,經過蒸餾處理的大多數原油,包括比重較大、粘度更大的原油,一般都分離為較輕組分(氣、汽油、粗汽油、煤油和粗柴油)和殘渣,或者更多稱作常壓重油。