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...
Solution: IFF inoperative in OFF mode.解决: IFF无法操作已关掉.The law has become inoperative.该法律己无效.This rule is inoperative until further notice.此规则何时生效待通知.Of course , Harrison's analysis was inoperative.哈里森的分析显然是站不住脚的....
Joseph watched a shady-looking bunch playing cards aboard a Mississippi steamer.约瑟夫看到一群可疑的人在密西西比河的一艘轮船上打牌。His eldest son Joseph carried on his father's traditions.他的长子约瑟夫继承了乃父的传统。Joseph made sure that he was never p...