The carbon is electrophilic centre.碳是亲电的中心.It will become deepen to the students'recognization in mechanism of Aryl electrophilic substitution.这些问题的讨论将深化学生对芳烃亲电取代反应机理的认识.The rate constants of radical and electrophil...
The results and offer useful data for studying pharmacology and medicine effects of arillus longan.为研究龙眼肉的药理、药效提供了有用的数据.Longan and the most suitable costumes fresh, lychee and other products.最适合盛装鲜桂圆, 荔枝等产品.Longan trees ...
He had written the note from memory, word perfect, and spelled atrociously.他凭着记忆作了记录，用词恰当但拼写错误百出。He had to have everything spelled out twice over for him.他不得不把所有事项都对他详细说明了两次。It looks like it's spelled wrong.看起来像是拼错了...
当他轻手轻脚地回到读经台时，他听到了劳伦斯神父冷冰冰的声音。When he crept back to his desk, he heard the dry voice of Father Laurence.他边讲道边用手捶打读经台.He thumped the lectern as he spoke.在粗糙的读经台后面, 偏向一边, 是一座挂着幕布的木偶戏台.Behind the crude lectern, off to a sid...
Among these plants , the most important families are as follows , Ranunculaceae, Berberidaceae, Menispermaceae, Papaveraceae, Rutaceae, Fabaceae, Apocynaceae, Solanaceae, Asteraceae and so on.其中主要的科为:毛莨科 、 小檗科、防己科 、 芸香科 ...