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...
The blouse is decoratively bordered at neck and sleeves.这件女衬衫领圈和袖口做得很花哨.Our garden is bordered on one side by a stream.我们的花园有一边以小河为界.... the mile of white sand beach bordered by palm trees and tropical flowers四周种有棕榈树和热带花...
In the ancient China, hermits usually lived in hamlets.在古代中国, 隐士们通常都住在小村子里.Some Buddhist monks live in solitude as hermits.有些和尚在僻静处隐居.We cannot live like hermits.我们也不能象隐士一样过活呀....