以改性Y分子筛为催化剂,γ-丁内酯和乙醇胺为原料,采用γ - 丁内酯法两步合成N - 羟乙基吡咯烷酮 ( NHP ).N - hydroxyethylpyrrolidone ( NHP ) was synthesized from � � - butyrolactone and ethanolamine on Y molecular sieve catalyst by two steps....
I shivered and pulled my scarf more tightly round my neck.我打了个寒战，用围巾把脖子围得更紧了。Hundreds of tightly rolled newspapers were set aflame among the 50,000 crowd.几百张卷紧的报纸在为数5万的人群中被点燃。The sudden height dizzied her and she clung t...
Chariots rumble and roll ; horses whinny and neigh.车辚辚, 马萧萧.The silence of the night was punctuated by the distant rumble of traffic...夜晚的寂静被远处车流的隆隆声打破。We could tell from the rumble of the thunder that rain was coming.我们...
盖茨以一篇有关部署策略的鸿篇大论予以回应。Gates responds with a lengthy discourse on deployment strategy.罗伯特·盖茨坐在他们面前，对过去的事几乎无颜以对。Robert Gates sat before them, almost penitent about the past.微软总裁比尔∙盖茨the Microsoft supremo, Bill Gates...