发布于:2025-07-06 06:25浏览量:131文/优校网
1.【化】提浓,蒸浓,浓缩;浓度;稠密度;【矿】汰选,选矿,富化
2.集中
3.集中注意,专心
1.the process of giving all your attention to something
2.a large number of people or things in one area or a large amount of a particular thing
3.the amount of a substance that is present in something
4.a major at a college or university
1.the process of giving all your attention to something
2.a large number of people or things in one area or a large amount of a particular thing
3.the amount of a substance that is present in something
4.a major at a college or university