Medicine intermediate N - ethylethylenediamine ( NEED ) was synthesized from acrylamide and ethylamine by addition reaction and Hofmann rearrangement.以丙烯酰胺为起始原料,经乙胺加成后,再经Hofmann重排两步反应后合成了药物中间体N - 乙基乙二胺 ( NEED )....
Accusing us of being disloyal to cover his own sorry behavior is truly execrable.他指责我们不忠诚以掩盖他自己的错误行为,真令人厌恶。Convenience is, however, in all affairs of life, an execrable test of value.然而在生活事务的各方面, 利益是可恶的价值准则.He stood at t...
He was criticized for his infraction of the discipline.他因违反纪律而受到了批评。When infraction or perisplenitis occurs, however, pain in the region of the spleen may be intense.然而, 若发生梗塞或脾周围炎, 则脾区疼痛可加剧.Therefore, in our case, escap...
岩基的定义是巨大的花岗石侵入岩体.A batholith has been defined as a huge intrusive mass of granitic rock.川西乡城地区的玻镁安山岩基质中辉石微晶具有奇特的枝晶形貌.Pyroxene crystallites in boninite matrix possess peculiar dendritic morphological features in the Xiang...