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.N, N - diethylaniline was synthesized under normal tempreture with tetraethyl ammonium hydroxide as phase transfer catalyst.利用β-环糊精-1,2-二溴乙烷乙醇混合体系作增敏剂首次提出了用荧光光度法测量阿苯达唑含量的方法.A fl...
Mr Wallace tries to co-opt rather than defeat his critics.华莱士先生竭力拉拢而不是击败他的批评者们。For further information on the life of William James Sidis, see Amy Wallace, "The Prodigy".想了解关于威廉·詹姆斯·西迪斯生平的更多信息，请参阅埃米·华莱士所著《神童》。Speeches de...
He had bowed out gracefully when his successor had been appointed.他在继任者被任命后体面地引退了。She loved the gracefully high ceiling, with its white-painted cornice.她喜欢这里高高的天花板，它造型优美，还带有一圈漆成白色的飞檐。She stepped gracefully onto the stage...
The potassium chromate method is one regular method to determine COD.重铬酸钾法是测定化学需氧量的常规方法.It's a two - component, chromate free, epoxy polyamide adduct shop primer especially designed.是一种不含铬的双组份环氧聚酰胺加成物的车间底漆.Two - sta...
Moths flew in front of it, eventually settling on the rough painted metal.几只蛾子在它前面飞，最终落在了那块粗糙的喷漆金属上。The order Lepidopteran consists of the butterflies and moths.鳞翅目有蝴蝶,蛾.The moths tapped and blurred at the window screen....