In the reaction of acetylation and nitration 1,2 ? dichloroethane was used as solvent.在乙酰化、硝化反应中引入了1,2-二氯乙烷溶剂.Polyurethane demulsifier for crude oil were prepared from polypropylene glycol, xylene, toluenediiso - cyanate...
Michel Foucault (1972), The Archaeology of Knowledge; hereafter this text will be abbreviated as AK.米歇尔·福柯（1972），《知识考古学》，下文简称AK。Digital archaeology is an intercross field raised recently, which integrates information tec...
Many of the city's populace travel to work by subway or bus.许多城市的平民都是坐地铁或公共汽车上下班.But the old man quietly faced the menacing populace.只见老人面对着杀气腾腾的群众,神色从容.The populace at large is / are opposed to sudden change.人民群众普遍...
用餐前10分钟响铃。The bell rings 10 minutes before mealtime.我有几张婴孩时期的照片,可以看出我手上拿的是银做的响铃.My baby pictures show a silver rattle in my hand.她把闹钟拨到早晨五点响铃.She set the alarm for 5 a.m....