单项选择题
A.analysis B.design C.installation D.upgrade
The（）schemeinadatabasesystemisresponsibleforthedetectio...
单项选择题The（）schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.
A.query B.test C.check D.recovery
（）statementcanperformacalculationandstoretheresultinava...
单项选择题（）statementcanperformacalculationandstoretheresultinavariablesothatitcanbeusedlater.
A.Assignment B.Control C.I/O D.Declaration
Dataitemsareaddedordeletedfromthelistonlyatthetopofthe（...
单项选择题Dataitemsareaddedordeletedfromthelistonlyatthetopofthe（）.
A.queue B.stack C.tree D.linearlist
