本文原发表在本刊1990年第6期。因电脑排版出了故障,造成软盘紊乱,以致印出来的文章与原校样误差很大,出现不应有的错误,本刊为对作者、读者和报道的内容负责,决定予以重发。谨向作者、读者和武汉市汽车解体厂致歉。 This article was originally published in the journal No. 6, 1990. Due to computer typesetting failure, resulting in diskette disorder, so that the printed article with the original proof error is large, there should be no mistake, the magazine is responsible for the content of the authors, readers and reports, to be re-issued. I would like to apologize to the author, readers and Wuhan Automobile Disintegration Factory.