Application of samarium diiodide in mediating intramolecular cyclization reactions was reviewed.綜述了二碘化釤在分子內(nèi)環(huán)化反應(yīng)中的應(yīng)用.Sodium ethylate was used as catalyst in Baker - Venkataraman of cyclization, and all factors were studie...
Frank Deford is a special correspondent for Newsweek magazine.弗蘭克·德福特是《新聞周刊》雜志的特派記者。Our economics correspondent, James Morgan, is just back from Germany.我們的財(cái)經(jīng)記者詹姆斯·摩根剛剛從德國回來。From Nairobi here's our East Africa corre...
兩幅照片是搭接在一起的.The two pictures are made to lap over each other.最常用的連接結(jié)構(gòu)是搭接, 嵌接和平接.The most commonly used joint configurations are the lap , scarf, and butt joints.介紹一種基于網(wǎng)絡(luò)的平面連桿機(jī)構(gòu)搭接虛擬實(shí)驗(yàn)的方法.A method of network virtual experi...