以硫酸氢钾为催化剂,正丁酸和异戊醇为原料合成了正丁酸异戊酯.Isoamyl butyrate was synthesized by using potassium bisulfate as the catalyst.以硫酸高铈为催化剂,正丁酸和异戊醇为原料合成了正丁酸异戊酯.Isoamyl butyrate was synthesized by using ceric sulfate as the catalyst.以硫酸铈铵为催化剂,...
It was especially galling to be criticised by this scoundrel.被这个无赖指责让人尤其气愤。The insolence in the fellow's eye was galling.这家伙的傲慢目光令人恼怒.There is no metal - to - metal contact, therefore gate galling is impossible.不存在金...
Purpose : To analyse the MR manifestations and clinical significance of Empty Sella Syndrome ( ESS ).目的:分析空蝶鞍综合征 ( ESS ) MR表现及临床意义....vast tracts of empty land, much of it contaminated by years of army activity.大片撂荒的土地,其...