Objective To study the catalytic activity of potassium bisulfate in synthesizing hexyl hexanoate.目的研究硫酸氢钾在合成己酸己酯工艺中的催化性能.Isoamyl butyrate was synthesized by using potassium bisulfate as the catalyst.以硫酸氢钾为催化剂,正丁酸和异戊醇为原料合...
After protracted negotiations, Ogden got the deal he wanted...经过长时间的谈判，奥格登得到了他想要的那笔生意。The struggle would be bitter and protracted.斗争将会艰苦而漫长。We won victory through protracted struggle.经过长期的斗争,我们取得了胜利.The war was protracte...
By 1973, this gap had narrowed almost to vanishing point.到1973年，这一差距已缩小到几乎为零。" To collect what's left over ,'smiled Wu Sun - fu , his look of despondency vanishing abruptly.“ 叫他回去收集残余, 都调到上海来.He wonderfully che...
He says this contract should not be patterned after the Deere pact.他说这个合同不应该模仿《迪尔协定》。...roses patterned on a blue background...蓝底上的玫瑰花样...a plain carpet with a patterned border.有饰边的纯色地毯a patterned wood inlay可以组成图案的木制镶嵌物....