N, N - diethylaniline was synthesized under normal tempreture with tetraethyl ammonium hydroxide as phase transfer catalyst. 以苯胺和溴乙烷为原料,用四乙基氢氧化铵作相转移催化剂,在常压下合成N, N二乙基苯胺.
Peace it seemed might at last be no more than a few months away.看起来，几个月内也许会最终实现和平。It was the first time Jane and I had been apart for more than a few days...那是我第一次和简分开数日。Commonsense now dictates that it would be wise to ...
Locally dolomite and anhydrite are important as cements.局部地方白云石和硬石膏也是重要的胶结物.Locally dolomite and anhydrite are important as cements , together with minor authigenic quartz.在局部地方白云石和硬石膏也是重要的胶结物;还有少量自生石英.Macro - defect - f...