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....
The fossils at Dinosaur Cove are embedded in hard sandstones.恐龙峡谷中的化石都嵌在坚硬的砂岩中。'This is a handy cove,'says he, at length,'and a pleasant sittyated grog - shop.“ 这海湾位置不错, ”他终于开口说道, “ 这小旅店算是选对了地方.'You a...
The high rate of desertion has added to the army's woes.高逃兵率更使部队雪上加霜。Thanks for listening to my woes.谢谢您听我诉说不幸的遭遇。She has cried the blues about its financial woes.对于经济的困难她叫苦不迭....
North American dark bluish - gray gallinule.北美深蓝灰色的水鸡.The pumpkin is the only esculent of the orange family that will thrive in the North.南瓜是柑橘科中唯一能在北方种植的蔬菜.They sailed across the Baltic and North Seas with only a compas...
那时他的脸因为晒伤而脱皮。His face, at the moment, was peeling from sunburn.严重的脸部或背部晒伤会非常疼痛。A badly sunburned face or back is extremely painful.她的皮肤晒伤了，使得想要亲热一下都变得很痛苦。Her sunburn made intimacy too painful....