Nefedipine was synthesized with m - Nitrobenzaldehyde, ethyl acetoacetate ammonium acetate.以间硝基苯甲醛, 乙酰乙酸乙酯,氨化试剂为原料.Fructone was synthesized from ethyl acetoacetate and glycol using activated carbon supported phosphotungs...
He disclosed the GEM Listing, delisting and other transactions, asas the rules will be introduced.他透露,创业板上市 、 交易以及退市等有关规则将陆续出台.Everywhere he went he was introduced as the current United States Open Champion.他所到之处人们都介绍他是本...
他被弗兰克·弗雷泽中尉顶替。He was replaced by Lt Frank Fraser.他走了谁来顶替他?Who's going to take his place after he leaves?我去找个人来顶替你.I'll find someone to fill in for you....