以寿命周期内维修总费用为优化目标，确定不完全维修条件下基于回复因子的最佳维修时间间隔和最佳维修次数。
The optimal repair interval and repair times for the imperfect repairs based on the restoration factor were determined for minimizing the total system repair costs.
如果你的机器符合以下条件之一的，都属于人为损坏，需进行保外付费维修。
If your machine meets one of the following conditions, are man-made damage, need to pay for maintenance.
结构的耐久性是结构必须满足的基本功能之一，既与设计、施工和材料等因素有关，又与使用环境和维护维修等条件有关，它直接影响结构的使用寿命。
Durability of structure is one of the basic function which structure is essential, it is closely to design, construct, material and employ environment, maintenance, it direct to effect working life.
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