单词：concentrators
(concentrator 的复数) n. 集中者, 浓缩器, 选矿机
[计] 集线器, 集中器
[计] 集线器, 集中器
plural of concentrator
n. An apparatus for the separation of dry comminuted
ore, by exposing it to intermittent puffs of air.
n. An apparatus for the separation of dry comminuted
ore, by exposing it to intermittent puffs of air.