简要介绍以此类方法对合成苯甲醛的研究.Based on the reactions , this paper reports research for synthesizing benzaldehyde.再溴代得到2-溴 -4,5-二甲氧基苯甲醛,收率为91.9%,并分析溴代过程中甲酰基的邻位效应及溴代产物的稳定性.This product with Br 2 was obtained 2 - bromo - 4,5 - hydroxy...
先辈们的丰碑最能奋勉人心的.The monuments of men's ancestors were the most impressive exhortations.人们失去了他们先辈的朴实,他们应该为此而感到懊丧.One may regret to have lost the simplicity of one's forefathers.他跟随着先辈的足迹前进.He followed in the steps...
" And then he disappears at the turn of the pass , Leaving behind him only hoof - prints . "山 回路 转不见 君, 雪上空留马行处.The horse snorted and stamped its hoof impatiently.这匹马呼哧呼哧地喷着气,不耐烦地跺着蹄子.I thought he would show the cloven h...
We miraculously survived the crossing to Muscat.我们奇迹般地活着来到了马斯喀特。A schoolboy miraculously survived a 25 000-volt electric shock.一名男学生在遭受2.5万伏的电击后奇迹般地活了下来。A schoolboy miraculously survived a 25 000 - volt electric shock.一名...