并对此方法从拖拉机所有者追求经济利益的角度，确定了大修制拖拉机最佳更新期与合理更新期的经济界限。
Then, both optimal and rational renewal cycle under different conditions were analyzed from the viewpoint of optimizing the economical benefit of the tractors owners.
设备预防维修期与更新期的确定，能使设备在使用期中，投入最佳的维修费用，发挥它的最大效用。
The determination of the preventive maintenance period and replacement period makes it possible to maximize the equipment efficiency with minimum maintenance expences during its usage life.
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