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 ( ...
He stood emotionless as he heard the judge pass sentence.他面无表情地站在那里，听法官宣布判决。Flying at 1,000 ft. he heard a peculiar noise from the rotors.在1,000英尺的高度飞行时，他听到旋翼发出一种奇怪的噪音。Rose heard the familiar voice, but tuned out the wor...
Duffy's primitive guitar playing is well below par.达菲粗糙的吉他演奏技巧远不够水平。The conditions are primitive by any standards.无论用什么标准来衡量，其条件都很简陋。It's using some rather primitive technology.它使用的是非常古老的技术。...