The machine is of no-screen type structure, non-blocking, grinding , wind grading and secondarygrinding are finished at the same time;
该机为无筛式结构，不堵塞，粉碎、风力分级及再粉碎同步完成；
2
The secondary mirror must be adapted during the process of grinding and polishing to this other form .
副镜在磨制和抛光过程中必须与此新形状相适应。
3
They adopted a few measures such as improving fineness of grinding ores, increasing secondary cleaning, using additional typed reagent and so on, thus making the technical indexes raised markedly.