以单质碘为催化剂合成了环戊酮乙二缩酮.Cyclopentanone ethylene ketal was synthesized with I _ 2 as catalyst.传统的缩酮化、酯化反应工业上多采用浓硫酸作催化剂.Traditional ketalization and esterification reactions are usually catalyzed by concentrated acid in industr...
He saw the apparition of his dead wife.他看见了他亡妻的幽灵.A harsh apparition ; tiny Midway was peculiarly set for air combat.小小的中途岛像个狰狞的魔影,说来也怪,竟被安排来作空战的场所.She claimed to have seen the apparition of her dead husband.她声称看到过亡夫的幽灵....
Students on the full-time course of study are usually sponsored.全日制学生通常都得到资助。The way she did it, mothering was a full-time job.照顾孩子于她是一件不得空闲的苦差事。The score at full-time was Arsenal 1, Sampdoria 1.比赛结束时阿森纳队和桑普多利亚队1比1战平。...
这一冲突实际上很有可能演变成国际化问题。A very real danger exists of the conflict becoming internationalised.如果您想犒劳一下自己，马耳他希尔顿酒店将为您提供高水准的国际化服务。If you want to treat yourself, the Malta Hilton offers high international standards.尼克松感谢叶海亚愿意接受救...