A.analysis B.design C.installation D.upgrade
单项选择题The()schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.
A.query B.test C.check D.recovery
单项选择题()statementcanperformacalculationandstoretheresultinavariablesothatitcanbeusedlater.
A.Assignment B.Control C.I/O D.Declaration
单项选择题Dataitemsareaddedordeletedfromthelistonlyatthetopofthe().
A.queue B.stack C.tree D.linearlist
单项选择题()meansthataprogramwrittenforonecomputersystemcanbecompiledandrunonanothersystemwithlittleornomodification.
A.Portability B.Reliability C.Availability D.Reusability
单项选择题()hasbecomeafactofmodemlife,withmillionsofpeoplenowshoppingon-line.
A.E-mail B.E-commerce C.E-Iearning D.E-communication