单项选择题

______is one of the techniques used for estimating activity durations．

A．Analogous Estimating
B．Precedence Diagramming Method(PDM)
C．Dependency Determination
D．Schedule network Templates
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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 infonnation(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
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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