单项选择题

（）estimating is a technique for estimating the duration or cost of an activity ou project using historical data from a similar activity or project.

A、Parametric
B、Analogous
C、Three-point
D、Expert judgment

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单项选择题
Cloud-computing providers offer their “services” according to different models, which happen to form a stack（）, platform as a service (Paas), software as a service (SaaS)

A、hardware as a service (Haas)
B、network as a service (NaaS)
C、infrastructure as a service (IaaS)
D、data as a service (DaaS)
单项选择题
In an Information system. The（）is the bridge between hardware and people

A、keyboard
B、internet
C、disk
D、data
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