在纪录片《与恐龙同行》中可以看到最新的、更加生动的电脑特效技术。Recent, more dramatic use of CGI was seen in "Walking With Dinosaurs".新一代科学家对恐龙研究着了迷。A new generation of scientists became fascinated by dinosaurs.恐龙峡谷中的化石都嵌在坚硬的砂岩中。The fossils at Dinosaur...
Pharmaceutical Industry for the production of Bicyclohexane Piperidine BENZTROPINE Dihydrobrohide, diphenhydramine hydrochloride salt.医药工业中用于生产双环己哌啶 、 苯甲托品氢溴酸盐,苯海拉明盐酸盐等....
方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.METHODS: The target compound was prepared by the bromination and amination reaction.论述了三丙酮胺纯度对加氢和还原胺化反应的影响.The effects of triacetoneamine concentration on hydrogenation and amination were discusse...