1. The average molecular weight and bromine number were used to calculate weightpercent of olefine in petroleum products.
   中心句給出了由石油分別分子式量和溴值核算石油的烯烴百分硫含量的最簡單的方法。
2. The results show that thiophene can inhibit effectively the coking of light gas oil in promoting pyrolysis of light gas oil and increase the olefine yields.
   結果表達噻吩能高效遏制輕汽油車的結焦，并可增進輕汽油車裂解，增加烯烴提取率。