其金属取代物能和环戊酮顺利地反应得到40.Its metallation and addition to cyclopentanone proceeded well to 40.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.比较研究了三种含苄叉环戊酮基团的新型香豆素类光敏染料.Absorption spect...
Leaching of copper from chalcocite with acidic acetonitrilecopper sulphate system was studied.研究了用酸性乙腈硫酸铜体系从辉铜矿中提取铜.The paper discusses a new method for producing cupric feed copper sulfate by chalcocite and ehalcopyite....
Double Happiness Super Standard Ball standard of ITTF for any match.红双喜超级三星乒乓球国际乒联(ITTF)特准之比赛用球.ITTF stands for International Table Tennis Federation.ITTF是国际乒乓球联合会的简称.What does ITTF stand for?ITTF表示什么?...
Bullies pick on younger children.坏孩子专挑年纪更小的孩子欺负。Why do you always pick on me to do the unpleasant jobs?你为什么老是找我干这些令人不愉快的工作?I know someone has to fetch some more logs, but why pick on me?我知道得有人再去捡些木柴, 但为什么挑上了我?...
The Memorial seems almost ugly, dominating the landscape for miles around.那座纪念碑耸立在方圆数英里景致之中显得近乎难看。He is dominating and active in manner.他有领导作风而且能采取主动.The boy was brought up by his mother, who was a dominating influence i...