单项选择题

The two goals of an operation system are（）and efficiency.

A．convenience
B．quick
C．optimize
D．standardize

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单项选择题
Network software consists of（），or rules by which processes can communicate．

A．protocols
B．programs
C．devices
D．computers
单项选择题
Software（）activities consume a large portion of the total life-cycle budget．

A．repair
B．maintenance
C．change
D．update
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