The feasibility of increasing open pit′s service life by deeping the final mining elevation, treating lean copper ore in the piles, recovering stope side ore is discussed.
论述了延长铜山口矿露天采场服务年限的必要性 ，探讨了通过延深最终开采标高、处理堆场贫铜矿、回收挂帮矿量等途径以达到延长露采服务年限目的的可行性。
The deeping of the electric machine theory and many concepts, and the change of calculating method on electrical machines due to the numerical calculation of magnetic field are also analysed.
文中还分析了由电磁场数值计算引起的电机学理论和一些概念的深化，以及电机分析计算方法的变化。
Deeping teaching reform is an important task for school physical teaching at present. This essay probes into the design and practice of the best plan in physical teaching process.
深入进行教学改革，是当前学校体育教学的一项重要任务。本文就体育教学过程的优化方案设计与实施进行了探讨。
Deeping teaching reform is an important task for school physical teaching at present. This essay probes into the design and practice of the best plan in physical teaching process.
深入进行教学改革，是当前学校体育教学的一项重要任务。本文就体育教学过程的优化方案设计与实施进行了探讨。
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