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此文是参加本刊２００１年第 ２期和第９期两篇关于 汽车起重机“软腿”现象原因讨论的文章，感谢读者热情的参予。
This article is to participate in this issue in 2001, No. 2 and No. 9, two articles on the truck crane “soft leg” discussion of the reasons for the article, thank readers for their enthusiastic participation.