清选 meaning in English

refining

This consists for the most part in straightening up, cleaning, and, on thicker plates above 5/16 in vee-ing the edges .
主要是矫直，清选，对于厚度超过516英寸的金属板，还需将焊边做成V形坡口。
Testing and qualification method for air - screen separator
风筛清选机试验鉴定方法
Technique specification for fine air screen seed cleaner
风筛式种子清选机.技术条件
Testing and qualification method for complex seed cleaner
复式种子清选机试验鉴定方法
A study on the seed static cleaner - grader
种子静电清选分级装置的研究

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