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。
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