采用1,4- 丁二醇 、 马来酸酐及十八醇为主要原料,合成出一种双子表面活性剂1, 4- 丁二醇双琥珀酸十八醇双酯磺酸钠.A new type gemini surfactant was synthesized from 1,4 - butanediol , maleic anhydride and 1 - octadecanol.研究了加入聚对苯二甲酸丁二醇酯(PBT) 对酚醛塑料的增韧改性.A phenolic resin was ...
娜塔莎拿起外套披在肩上。Natasha took the coat and draped it over her shoulders.娜塔莎紧紧缠着在孤儿院拍摄电影的工作人员不放。Natasha attached herself to the film crew filming at her orphanage.索菲亚·彼得罗夫娜拉拢娜塔莎做她的助手。Sofia Petrovna co-opted Natasha as her assi...
school的近义词有:college, university, institute, school, academy。下面这些名词均含有"学院,大学"的含义:college:多指大学内的学院,分科学院或科目较少的高等学校。university:主要指综合大学,一般由多个学院组成。当泛指大学时通常用college表示。institute:指设立有专门学科的学院,如外语学院、地质学院、建筑学院等。school:指大学所属的学院或系。aca...
One of the victims of the weekend'ssnowstorm has been named as twenty-year-old John Barr.周末暴风雪中的一名罹难者已确认是20岁的约翰·巴尔。Objective To explore the child pneumonia in infection circumstances of Coxsackie B virus ( CVB ), Cy...