This paper analyzes the glyceryl polyether by nuclear magnetic resonance ( NMR ) spectroscopy .用 核磁共振 分析了甘油聚醚.The preparation of catalysts , yield of glyceryl triacetate and and demerits the catalysts were introduced bri...
The preparation of catalysts , yield of glyceryl triacetate and and demerits the catalysts were introduced briefly.对上述催化剂制备、三醋酸甘油酯收率、催化剂优缺点作简要介绍.This paper analyzes the glyceryl polyether by nuclear magnetic resonance ( ...
Lack of food and supplies caused disaffection among the soldiers.食物和补给的不足造成士兵的不满.I have endeavoured to give in their briefest outline the reasons for my disaffection.我已经尽力简短地说明了我产生不满情绪的原因....people's disaffection wi...
Zoe Bannister hunched over her veranda desk, correcting exercise books.佐伊·班尼斯特弓着身子,趴在她阳台的写字台上, 批改著作业.The desk is placed at the further end of the room.书桌摆在房间里较远的一头。...a modern reception desk with telephone and fax...有电话和...