这一期,让我们谈论字根history和它的派生词。1.history['histeri] n.历史例句: Only by studying history can we be aware of the past struggles of human beings.(只有通过研究历史,我们才能体会到人类过去的斗争。)2.historic[...这一期,让我们谈论字根history和它的派生词。1.history['histeri] n.历史例句: Only by studying history can we be aware of the past struggles of human beings.(只有通过研究历史,我们才能体会到人类过去的斗争。)2.historic[his'tarik]adj.有历史意义的例句:The Great Wall of China is a historic structure which draws millions of tour- ists every year,(中国的万里长城是具有历史意义的建筑物,每年吸引了数以百万的旅客。)展开更多
A new bis(aroylacetylene) containing tfiazole and fluorene moieties is synthesized by click chemistry. Polycyclotrimerization of the monomer is catalyzed by piperidine in refluxed dioxane,furnishing a regioregular pol...A new bis(aroylacetylene) containing tfiazole and fluorene moieties is synthesized by click chemistry. Polycyclotrimerization of the monomer is catalyzed by piperidine in refluxed dioxane,furnishing a regioregular poly(aroylarylene) in a satisfactory yield.The hyperbranched structure of the polymer is characterized spectroscopically with satisfactory results.The polymer enjoys no metal detriment and is soluble in common organic solvents such as tetrahydrofuran (THF),chloroform,dichloromethane (DCM),and N,N-...展开更多
文摘这一期,让我们谈论字根history和它的派生词。1.history['histeri] n.历史例句: Only by studying history can we be aware of the past struggles of human beings.(只有通过研究历史,我们才能体会到人类过去的斗争。)2.historic[his'tarik]adj.有历史意义的例句:The Great Wall of China is a historic structure which draws millions of tour- ists every year,(中国的万里长城是具有历史意义的建筑物,每年吸引了数以百万的旅客。)
基金supported by the National Natural Science Foundation of China (Nos.20634020 and 50703033)the Ministry of Science & Technology (No.2009CB623605)+2 种基金the Research Grants Council of Hong Kong (Nos.603008,602707 and 602706)A.J.Q.acknowledges the support from the China Postdoctoral Science Foundation (No.20070420228)B.Z.T.thanks the support from the Cao Guangbiao Foundation of Zhejiang University.
文摘A new bis(aroylacetylene) containing tfiazole and fluorene moieties is synthesized by click chemistry. Polycyclotrimerization of the monomer is catalyzed by piperidine in refluxed dioxane,furnishing a regioregular poly(aroylarylene) in a satisfactory yield.The hyperbranched structure of the polymer is characterized spectroscopically with satisfactory results.The polymer enjoys no metal detriment and is soluble in common organic solvents such as tetrahydrofuran (THF),chloroform,dichloromethane (DCM),and N,N-...
