问题 问答题 论述题

如何提高浸提效果?

答案

参考答案:

从扩散公式可知,浸提的关键在于保持最大的浓度差。因此,浸提方法的选择和浸提设备的设计都应以创造最大的浓度差为基础。如用浸渍法浸提时,应时常搅拌或将药材悬浸于溶剂中。使用渗漉法时,将浸提溶剂从药材上面缓缓向下流动,自底部流出浸液。煎煮法浸提时加强搅拌,及时滤出浓煎液,加入新鲜溶剂。以上做法都是为了创造最大的浓度差,用浸提溶剂或稀浸提液随时置换药材粉粒周围的浓浸出液,从而提供最佳条件,以获得最佳的浸提效果。

阅读理解

阅读表达 (满分 10 分)

(1)The half-empty coffee cups, still standing next to their plates, tell of a morning like others. And yet, that grey covering of dust that everything wears tells a different story: it tells of screams, tears, confusion, terror and blood.

(2)Now the restaurant in the World Trade Center will never again serve breakfast. And never again will all those people go there to eat or work --- those people of America whose faces have entered our hearts. So many people whose faces we associate with life and liveliness _______ tonight. So many words remain unsaid, and so much happiness has been destroyed. In their places are tear-stained faces. My generation has seen this. On Monday, a fight with my sister and a bad grade seemed to be the biggest problems in the world. Tonight, so many people across the country know that America’s pain is at its worst ever. We have read about World War II, and we have seen the black-and-white pictures. But to most students, that’s an event on a textbook page that would never happen today.

(3) After all, this was a time of peace and wealth --- the United States was powerful and successful. There would be no more wars, and we were lucky to live in such a time. But when those planes hit; when firefighters with terror on their faces ran among the parts of the buildings that had fallen; when people screamed for their family members; when history was unfolding before our eyes, in full, clear colour ---- then we knew the world had been changed.

(4) Everything that had happened in the past seemed to take on new life through September 11, 2001. And when they say this is the worst wound in American soil, I say, I thought this place was an empire. And I say, I thought this was a time of peace. And I say, I thought we were safe.

(5) Knowing how many human beings turned to ashes in a second, and seeing some jumps from the buildings, I know that my generation is growing up in a world where mankind can still be evil. But seeing those heroes risk lives among the castle-like ruins, and seeing the eager blood donors at the hospitals, my generation has learned that tears are allowed, that mankind can also be beautiful, and that the ghost of evil will never defeat the spirit of good.

小题1:Why was the passage written? (no more than 7 words)

                                                                      

小题2:List two things that make the writer believe the world is still beautiful. (no more than 15 words)

                                                                                      

小题3:What does the underlined word “it” refer to? (no more than 8 words)

                                                                    

小题4:Fill in the blank with proper words. (no more than 3 words)

                                                                      

小题5:What event of the past did September 11 remind the writer of? (no more than 5 words)

                                                                      

多项选择题