Medicine intermediate N - ethylethylenediamine ( NEED ) was synthesized from acrylamide and ethylamine by addition reaction and Hofmann rearrangement.以丙烯酰胺为起始原料,经乙胺加成后,再经Hofmann重排两步反应后合成了药物中间体N - 乙基乙二胺 ( NEED )....
Acidity in soil can be neutralized by spreading lime on it.土壤的酸性可以通过在它上面撒石灰来中和.The intruder smashed a window to get in and then neutralized the alarm system.闯入者打碎了一扇窗户进来，然后破坏了警报系统。Rising prices neutralized increased wage...
Barcelona was chosen to be host of the 1992 Olympic games.巴塞罗那获选为1992年奥运会的主办城市。They are all glued to the Olympic Games.他们都被奥运会吸引住了。equestrian events at the Olympic Games奥林匹克运动会的马术比赛项目...
他一度被称为过分讲究精准的试飞员。He was once described as a fussily accurate test pilot.一记精准的任意球a scorcher of a free kick阿丹: 比例精准的温泉水和肥皂混合液.Dan: A very precise mixture of hot spring water and soap....