传统的缩酮化、酯化反应工业上多采用浓硫酸作催化剂.Traditional ketalization and esterification reactions are usually catalyzed by concentrated acid in industry.对甲苯磺酸铜是乙二醇与羰基化合物缩醛(酮)化反应的高效催化剂.Acetalization of glycol with carbonyl compounds was car...
请附上汇款，支票收款人为泰晤士河谷科技公司。Please enclose your remittance, making cheques payable to Thames Valley Technology.请将填好的表格连同汇款寄回。Please return the completed form with your remittance.他定期汇款给他父母.He sends regular remittances to his p...
足足有30%的贫困人口甚至连非法窝棚都住不起。Fully 30% of the poor could not even afford access to illegal shanties.篱笆, 窝棚,什么都七倒八歪,叫你一眼就瞧出那穷形窘状.Fences , sheds , everything had a ruined look, and were eloquent of poverty.他在窝棚外撒了尿,然后顺着大路走去叫醒孩子....