A.分布式數(shù)據(jù)庫、并行數(shù)據(jù)庫和主動(dòng)數(shù)據(jù)庫
B.層次數(shù)據(jù)庫、網(wǎng)狀數(shù)據(jù)庫和關(guān)系數(shù)據(jù)庫系統(tǒng)
C.圖像數(shù)據(jù)庫、工程數(shù)據(jù)庫和統(tǒng)計(jì)數(shù)據(jù)庫系統(tǒng)
D.面向?qū)ο髷?shù)據(jù)庫、演繹數(shù)據(jù)庫和對象-關(guān)系數(shù)據(jù)庫系統(tǒng)
A.0
B.1
C.2
D.3