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...
The Pharmacopoeias contain a very large number of preparations of Ipecacuanha, most of which are standardized.药典包含依必格酊的制剂, 多数已被规?化.The parts of an automobile are standardized.汽车零件是标准化了的.The company is in Shandong Provinc...
两名男子在船桥甲板上扶着一架梯子不让它摇晃。Two men were on the bridge-deck, steadying a ladder.船桥是配备有先进的现代电子导航仪器.The bridge is equipped with sophisticated modern electronic navigation instruments.在其他时候, 使用船桥上的液压助力转向装置.At other times, the hyd...