单项选择题

______means that a source program file can be compiled and executed on different computers.

A．Portability
B．Usablity
C．Recovery
D．Mobility
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单项选择题
A．getB．makeC．pushD．put
A．get
B．make
C．push
D．put
单项选择题
A query is used to search through the database to locate a particular record or records．which conform to specified______.
A．criteria
B．standards
C．methods
D．conditions
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