单项选择题

A computer network links computers together to allow users to share hardware, software, and (73)

A. resource B. file C. information D. data
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单项选择题
The basic concept of a data (72) is the difference between data and information.
A. warehouse
B. storage

C. base
D. service
单项选择题
There is free firewall software available that can run on minimal hardware and provide a good level of (71) to your network.
A. protective
B. profecting
C. protection
D. profection
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