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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单项选择题
Which of the following is not part of a modern quality management concept ______
A. Performance standard is zero defects
B. Quality must be inspected in
C. 85% of failures occur because of the process, not the worker
D. Quality is a 4 cycle process - plan/do/check/act
单项选择题
A ______ infected computer may lose its data.
A. file
B. database
C. virus

D. program
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