为了确定最佳破碎产品粒度，进行了碎磨功指数的测定工作，获得球磨给矿粒度与碎磨综合能耗的关系。
In order to find out the optimum economic crushing particle size, the work index of crushing and grinding have been obtain by through the test work.
用绩效指数比较了不同指点装置的操作绩效，对追踪球的优化设计提出了建议。
According to index of performance, the operation performance of different pointing devices was compared. The implication of the results to the optimal ergonomic design of trackball was also discussed.
用绩效指数比较了不同指点装置的操作绩效，对追踪球的优化设计提出了建议。
According to index of performance, the operation performance of different pointing devices was compared.
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