A typhus epidemic struck in the winter of 1919–20.1919至1920年的冬天斑疹伤寒症流行.the containment of the epidemic对流行病的控制There is abundant academic thinking and methods of truncating and reversing acute epidemic febrile diseases.《温疫...
This ensures that the data obtained can be related to data from other sampling sites.这样做就能确定已得到的数据同其它采样点数据之间的相互关系.Sampling the local cuisine is one of the delights of holidaying abroad.品尝当地菜肴是海外度假的乐趣之一。Objective To deter...
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 )....