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 was pacing the room like a caged animal.他像一头困兽一样在房间里走来走去.Aim : To synthesize carboxylate derivatives of caged bicyclic phosphate.目的: 合成笼状双环磷酸酯的羧酸酯衍生物.After the tiger was caught, it was caged.老虎被捉住后关进了笼子。Mark was still...
简·波洛克古董店经营银器和小收藏品。Jane Pollock Antiques deals in silver and small collectables.有些人会把这些奇怪的铁片与木块称作“古董”。Some would call these odd pieces of iron and wood "antiques"他声称把所有的钱都投进了自己的古董生意。He claimed he ploughed all his money in...