The optimal service life of a mine is discussed theoretically from economic point of view by analysing the cost and benefit.
本文采用成本与效益分析的方法，从经济上对矿井合理服务年限的定量问题，作了理论上的探讨。
As long as the data of failure time, failure time interval and maintaining cost are collected in operation of equipment, the optimal service life of equipment can be determined.
只要在设备的使用过程中注意收集设备的故障时间、故障间隔时间和维修费用，就可以确定出设备的最佳使用寿命。
High plasticizing performance with barrier screw. Melting performance and homogeneity optimized by additional compounding section. Long service life thanks to optimal choice of materials.
螺杆带阻隔器，塑化性能高。额外的混合区，计量和塑化更优化。优化选材，使用寿命长。
This paper introduces optimal control of packing seal to creatfavourable conditions for improving seal performance and increasing seal service-life.
本文着重介绍了填料密封方面诸因素的最佳控制状态，从而对提高密封性能、延长密封周期创造了良好条件。
It turned out that this method could assure bearing in optimal windage condition in concrete working condition, accordingly achieve the longest service life.
实践证明这种方法可以保证轴承在具体的工作条件下处于最佳的工作游隙状态，达到最长的使用寿命。
The industrial practice indicates that the quality of auto dies can be greatly enhanced and the service life of the auto dies can be prolonged remarkably through optimal plasma nitriding.
生产实践表明，合理离子渗氮可以大大提高汽车模具的质量和延长其使用寿命。
The industrial practice indicates that the quality of auto dies can be greatly enhanced and the service life of the auto dies can be prolonged remarkably through optimal plasma nitriding.
生产实践表明，合理离子渗氮可以大大提高汽车模具的质量和延长其使用寿命。
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