A.pptB.PDFC.CAJD.WORD
A.文獻型數(shù)據(jù)庫 B.全文型數(shù)據(jù)庫 C.數(shù)據(jù)型數(shù)據(jù)庫 D.事實型數(shù)據(jù)庫
A.- B.在結(jié)果中檢索 C.* D.+