A.Index Medicus B.International Nursing Index C.Index to dental literature D.Biological Abstracts
A.数据检索 B.事实检索 C.手工检索 D.文摘检索 E.文献检索
A.Author-corporate B.Author-first C.Author-last D.Author-full
A.MEDLINE B.PreMEDLINE C.CBM D.数据库商直接提供的数据
A.分析 B.标记 C.检索 D.管理 E.写作
