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...
这条道越过瓦尔山口之后，穿过于拜河畔圣保罗。After going over the Col de Vars, the route passes through St-Paul-sur-Ubaye.我们匆匆穿过湍急的那曲河畔这个毫无生气的小镇。We hurried through the colourless little town set on the fast-flowing Nyakchu.他拜访了住在河畔避暑别墅的亲戚。He v...
A doctor's life is consecrated to curing sick people.医生献身于医治病人。Drying methods include: hot air drying, electrothermic drying ( far infrared class ), UV - curing and drying.干燥方式分为: 热风干燥, 电热干燥 ( 远红外线类 ), 紫外线固化干燥.The U...
Many of the refugee villages are in isolated areas.很多难民村落都在偏远地区。Refugee workers said such action was a violation of medical ethics.难民工作者说那种行为是对医德的亵渎。Overcrowding and poor sanitary conditions led to disease in the refugee...