单项选择题
The（）schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.
A.query
B.test
C.check
D.recovery
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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
