improve the grade meaning in English

提高档次

Study on improving the grade of iron concentrate in heishan iron mine
提高黑山铁矿精矿品位的研究
Since establishing , are improving the grade on quality and on products technology constantly
自成立以来，不断在质量上及产品技术上提高档次。
We will renew follow - up equipments , and make it becoming a series product that can improve the grade of rice
该设备可根据用户要求，顺利补充后续设备，形成系列产品，方便用户提高大米档次。
Students may revise and resubmit the two essays to improve the grade within one week of the date on which the essays are returned
论文发还后的一周内，学生可以修订并重新提交这两篇论文来提高评分。
The system which will improve the grade of textile has simple structure , low cost , highly accuracy and quickly dynamic response
该系统结构简单、价格低廉、对花精度高、动态响应快，大大提高了纺织产品的档次。

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