以二羧酸和异丁醇为原料,用硫酸作催化剂,合成二羧酸二异丁酯.The diisobutyl dicarboxylate was prepared by using acid and isobutanol as material and acid as catalyst.以冰醋酸、异丁醇为原料,硫酸高铈为催化剂合成乙酸异丁酯.A method for synthesis of isobutyl acetate based on ceric ...
Science teacher's role should change elastically and multiply depending on the instruction context.教师的角色宜视教学情境脉络做弹性及多元的转换.Lana : Either an admirer or a psychopath, depending on who you ask.仰慕者或精神病, 看你问谁了.We are depe...
"Waltz with me," he said, taking her hand.“来和我跳支华尔兹吧，”他边说边牵起她的手。Even those of us with a tin ear can recognize a waltz.我们这些没有乐感的人也能听得出什么是华尔茲。Her singing of " Evening Waltz " was easy and lively, well - balanced and approp...