71、（）is the technology that appears to emulate human performancetypicaliy by learning,coming to its own conclusions, appearing to understandcomplex content, engaging in natural dialogs with people, enhancing humancognittive performance (also known as cognittive computing) or replacing peopleon execution ofnonroutine tasks.

A、Cloud service

B、Blockchain

C、Internet of things

D、Artificial intellingence

72、（）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

73、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

74、Estimate activity durations is the processof estimating the number of work periods to complete indivities with estimatedresources . the tools and technques is not including（）.

A、expert judgment

B、analogous estimating

C、requirements traceability matrix

D、three-point estimating

75、The process of translating the qualitymangement plan into executable quality activities that incorporate theorganization's quality policies into the project.

A、Manage quality

B、Quality audit

C、Quality metrics

D、Quality improvement

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