预先筛分 Screening In Advance

预充填筛管 restraining liner

环基型预充填筛管 ring base type pre-pack screen ; pack screen

肿瘤的预防和筛查研究 nutrition ; early detection ; chemoprevention

双层预充填筛管 dual screen prepack

预先筛选器 pre-filter

预防性筛检 preventive screening

预防性筛选计划 preventive screening program

非砾石预充填筛管 nongravel-packed screen