单项选择题

The connection between two networks to form an internet is handled by a machine known as a （）.

A. bridge
B. client
C. router
D. switch

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单项选择题
Configuration management is the process of managing change in hardware, software, firmware, documentation, measurements, etc. As change requires an initial state and next state, the marking of significant states within a series of several changes becomes important. The identification of significant states within the revision history of a configuration item is the central purpose of （） identification.

A. baseline
B. value
C. cost
D. Control
单项选择题
One tool that is useful during both analysis and design is the （）, which is a pictorial representation of the items of information (entities) within the system and the relationships between these pieces of information.

A. data dictionary
B. dataflow diagram
C. use case diagram
D. entity-relationship diagram
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