單項(xiàng)選擇題

（）statementcanperformacalculationandstoretheresultinavariablesothatitcanbeusedlater.

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

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單項(xiàng)選擇題

Dataitemsareaddedordeletedfromthelistonlyatthetopofthe（）.

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

單項(xiàng)選擇題

（）meansthataprogramwrittenforonecomputersystemcanbecompiledandrunonanothersystemwithlittleornomodification.

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