这篇文章是程博士在中国化学会,中华化学工业会及中国化学工程学会三团体举行联合年会时,特地为本刊撰的。他说要把一点小意思提出来,贡献给化学工业界当局和学术研究者的参考。吾们要感谢他的好意,同时希望读者都能接受他的好意。 This article is Dr. Cheng specially published for this journal at the joint annual meeting of the three groups of Chinese Chemical Society, Chinese Chemical Industry Association and Chinese Chemical Engineering Society. He said he would like to put forward a little bit of trivial meaning and contribute to the reference of chemical industry authorities and academic researchers. We want to thank him for his kindness, and hope that readers will accept his kindness.