單項選擇題The()schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.

A.query
B.test
C.check
D.recovery


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A.Assignment
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C.I/O
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2.單項選擇題Dataitemsareaddedordeletedfromthelistonlyatthetopofthe().

A.queue
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3.單項選擇題

()meansthataprogramwrittenforonecomputersystemcanbecompiledandrunonanothersystemwithlittleornomodification.

A.Portability
B.Reliability
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4.單項選擇題()hasbecomeafactofmodemlife,withmillionsofpeoplenowshoppingon-line.

A.E-mail
B.E-commerce
C.E-Iearning
D.E-communication

5.單項選擇題Thedata()includesthefunctionofupdatingdataonadatabase,andretrievingdatafromadatabase.

A.management
B.storage
C.analysis
D.communication