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....
One is also able to see how specific acts are related to a temporal and spatial context.人们也能看出具体行为是如何与时空相关联的。Sometimes temporal fluctuation may take place inthe local velocity.有时,在局部速度中可能出现瞬时脉动.Fluctuations are spatial a...
You have your point of vie, and I have mine.你有你的观点, 我有我的观点.In hospitals, business plans vie with patients for doctors' attention.在医院，经营方针和病人都是医生所要关心的。Plaisir d'amour ne dure qu'un moment, chagrin d'am...