据调查,目前一些垦区使用的拖拉机中有三分之一以上是超年限的,这是造成拖拉机修理费用逐步增加、经济效益不断下降的主要原因。那么,机龄和修理费之间是否存在某种相关关系,并找出具有足够精度的函数关系,以此来定量地分析拖拉机的最佳使用年限,这是本文拟加以讨论的问题。 拖拉机的年维修费用受多种因素的影响,如产品结构、制造质量、使用环境、操作水平、维护保养状况等因素,若要找出年 According to the survey, more than one third of the tractors currently used in some reclamation areas are over-years-old, which is the main reason causing the gradual increase of tractor repair costs and the declining economic benefits. Then, whether there is some correlation between the age and the repair cost, and find out the functional relationship with sufficient accuracy, so as to quantitatively analyze the tractor’s optimal service life, is the issue to be discussed in this article. The annual maintenance cost of a tractor is affected by many factors, such as product structure, manufacturing quality, use environment, operation level, maintenance status and other factors. If you want to find the year