单项选择题

Estimate Activity Durations is the process of estimating the number of work periods to complete indivities with estimated resources . The tools and technques is not including（）.

A、expert judgment
B、analogous estimating
C、requirements traceability matrix
D、three-point estimating

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单项选择题
（） includes the processes required to ensure that the project includes all the work required , and only the work required , to compete the project successfully . Managing the project scope is primarily concerned with defining and controlling what is not included in the project.

A、Create scope
B、Project stakeholder management
C、Preject scope management
D、Project cost management
单项选择题
（）is a decentralized, distributed and public digital ledger that is used to record transactions across many computers so that the record cannot be alterred retroactively without the alteration of all subsequent blocks and the collusion of the network.

A、Cloud service
B、Blockchain
C、Internet of things
D、Artificial intellingence
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