单项选择题

Communication networks can be classified in terms of their physical arrangement or (74) . Three common (74) are the star, bus, and ring.

A. structures
B. topologies
C. protocols
D. frames
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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
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
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