Isoamyl butyrate was synthesized by using potassium bisulfate as the catalyst.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 ceric sulfate 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 bu...
The progresses in the synthesis study of isoamyl isovalerate at home and abroad were reviewed.综述了国内外对异戊酸异戊酯的合成研究的进展情况.Isoamyl butyrate was synthesized by using potassium bisulfate as the catalyst.以硫酸氢钾为催化剂,正丁酸和异戊醇为原料合成了正...
上个星期六我和老友晚上去闹市玩乐了。Last Saturday, I was out on the town with my mate.是家人和老友帮助我始终做到脚踏实地。Family and old friends help me stay grounded.西恩打电话给老友南西.Sean calls his long - time friend, Nancy....
Some people like to lie on the beach, but I prefer to go sightseeing.有些人喜欢在海滩上躺着, 但我喜欢去游览.A sightseeing tour of the city is included to help you get your bearings.市区观光游也包含在内，帮助你熟悉一下这里的情况。Most of our time was spent in sig...