METHODS: The target compound was prepared by the bromination and amination reaction.方法: 用溴代及胺化反应合成了四甲基吡嗪衍生物.The effects of triacetoneamine concentration on hydrogenation and amination were discussed.论述了三丙酮胺纯度对加氢和还原胺化反应的影...
The process of chlorine leaching - purification - electrowinning for nickel extractioncopper residue is investigated.研究通过氯气浸出 - 净化 - 不溶阳极电积法生产电镍的工艺过程.The research results of recovering copper by electrowinning from conce...
The doctor asks how he can be amazedly so cropland.医生吃惊地问他怎么会弄到这般田地.A great ship asks for deep waters.大船要走深水。Goodwife asks famous tenor singer Simier sings a lyric song.女主人请闻名男高音歌唱家斯米尔唱一首抒情歌曲.Lucilla often asks her siste...
These rude tribesmen live in the rain forest.这些未开化的部落人生活在雨林之中.The bullhorn acacia is not a tree of the dark windless depths of the tropical rain - forest.牛角相思树不喜欢在阴暗不透风茂密的热带林区中生长.The island is covered with red soil and d...