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system on railroad. to make the product meet the actual needs, he faced down many practical problems, such as high reliability and volume and weight of the product. working hard and independently, he cracked the problems one by one, and came up with a thesis that was characterized by academic excellence.judging by his outstanding performance while he studied with me, i am convinced that mr. ren has acquired the knowledge and intellectual sophistication on the basis of which he can undertake worldclass training. i therefore lend him my enthusiastic support and would appreciate your favorable consideration of his application.sincerely yoursli li大學(xué)就業(yè)介紹信篇三li lichinese academy of sciencesbeijing 100080, . chinadea