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成了正丁酸异戊酯.Isoamyl butyrate was synthesized by using ceric sulfate as the catalyst.以硫酸高铈为催化剂,正丁酸和异戊醇为原料合成了正丁酸异戊酯.Isoamyl bu...
The lines of his fastidious face showed a vague disquietude.那过分讲究的面孔上的表情是一种隐隐的不安.The disquietude of his air, the somewhat apprehensive impatience of his manner, surprised me.他神情不安, 急躁的举止中有点担忧, 这使我吃了一惊....
They drove the ponies into a corral.他们把矮种马赶进了畜栏。The kids were kept in the small corral.羊羔圈养在小畜栏里.After we corral the horses we'll have lunch.把马关进围栏后,我们就吃中饭....
Figure 4 - 2 shows a present - day laboratory version of the electroscope.图4 - 2就是目前实验室里的验电器样式.The leaves of the electroscope slowly diverge.验电器的叶片慢慢张开.Figure 4 - 2 a present - day laboratory version of the electroscope....