The alkylation of isoparaffin with olefin is an important process of petroleum processing.异构烷烃与低分子烯烃的烷基化反应是石油加工的重要过程之一.This makes isoparaffin analysis pass thermo vaporation separation examination from the sample hydroca...
这四枚新邮票是为了纪念英国天文协会成立100周年而发行的。The four new stamps mark the 100th anniversary of the British Astronomical Association.在历史的年代数目和天文年代数目之间存在差别.There are differences between historical and astronomical numbering of years.数学材料是...
She dabbed iodine on the cuts on her forehead.她把碘酒轻搽在前额的伤口上。She dabbed a drop of the musky perfume behind each ear.她在两耳后分别擦上一小滴麝香香水。She dabbed herself with scent.她在身上擦了一点香水。...