1)sand filter bed,砂滤床2)gravel and sand filter bed,砂砾滤床3)sand bed filter,砂滤器，砂滤床4)sand-bed filtration,砂床滤失量5)intermittent sand filter,间歇砂滤床6)sand bed,砂层;(过滤池)砂床
用法例句
Such items as API filtration, HTHP filtration, sand-bed filtration, HTHP sand-bed filtration, core filtration, core bearing ability, fissure openings plugging ability and permeability recovery of the fluid were evaluated in lab.
