A method of synthesis of butyl isobutyrate catalyzed by amidosulphonic acid has been studied.以氨磺酸为催化剂催化合成了异丁酸丁酯,确定了酯化优化条件.The method about synthesis of approximate straight line motion mechanism based on moving centrode ...
我并非自夸，我的厨艺的确高超。I'm a good cook, though I say it myself.他的话不仅仅是虚张声势的自夸。His statement isn't merely an idle boast.他自夸自己能流利地讲6种语言.He boasted that he could speak six languages fluently....