单项选择题

In software engineering and systems engineering, ______ is a description of a system’s behavior as it responds to a request that originates from outside of that system.

A．blackbox
B．business rule
C．use case
D．traceability matrix
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单项选择题
The standard (IEEE 802) format for printing ______ in human-friendly form is six groups of two hexadecimal digits, separated by hyphens (-) or colons (:), in transmission order, e.g.01-23-45-67-89-ab, 1:23:45:67:89:aB. This form is also commonly used for EUI-64.
A．hard disk logical block address
B．IP address
C．mail address
D．MAC address
单项选择题
A ______ infected computer may lose its dat
A．A. fileB. databaseC. virusD. program
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