单项选择题

The（）schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.

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

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单项选择题

A.Assignment
B.Control
C.I/O
D.Declaration

单项选择题

A.queue
B.stack
C.tree
D.linearlist

单项选择题

（）meansthataprogramwrittenforonecomputersystemcanbecompiledandrunonanothersystemwithlittleornomodification.

A.Portability
B.Reliability
C.Availability
D.Reusability