1) prescreening
['pri:'skri:niŋ]
预先筛分
1.
By adding prescreening before secondary crusher,the technical transformation of crushing technology was done in Sanshimudi concentrator.
通过增加中碎前预先筛分,对三十亩地选矿厂碎矿工艺流程进行了有效的技术改造。
2) pre-classification
预先分级
1.
The original mineral of Dading Iron Mine was processed by the technique which in- cluded pre-classification, dry magnetic separation to discard dirt, magnetic separation of the coarsely ground ore, scondary grinding and secondary magntic separation of the rougher con- centrate, thus raising the processing quantity of the crude ore, reducing the grinding cost, with the grade of iron concentrate 65.
采用预先分级、干式磁选抛废、粗磨磁选、粗精矿再磨再磁选的工艺流程处理大顶铁矿原生矿，提高了原矿处理量，降低了磨矿成本，获得铁精矿品位６５。
4) preassigned
预先指定的，预先分配的
5) pre-hydrotreatment over zeolite
分子筛预加氢
6) molecular sieve prepurifying
分子筛预净化
补充资料：国防科学技术先期技术开发(见国防科学技术预先研究)
国防科学技术先期技术开发(见国防科学技术预先研究)
advanced technology development of national defense science and technology
guomng kexue listiu Xlanqi lishu切ifa国防科学技术元期仪不井汉哗u-vanced teehnology develoPment ofnationalde-fense seienee and teehnology)见国防科学技术预先研究。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条