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71、When performing project activity duration estimates，（ ）is not included in the estimation techniques.

A、Three-point Estimating

B、Analogous Estimating

C、Parametric Estimating

D、Checklist Estimating

72、Self-driving technologies are important for the research and development in the field of（ ）.

A、Cloud Computing

B、Digital Finance

C、Artificial Intelligence

D、Intelligent Manufacturing

73、To build a modern logistics system，we should work on the（ ）of its infrastructure，including railways and ports，and promote the integration of resources in the sector.

A、digital transformation

B、new generation of communication technology

C、block-chain technology

D、VR and AR

74、Information security emphasizes the security attributes of information (data） itself（ ）is not included in the security attributes.

A、Confidentiality

B、Consistency

C、Integrity

D、Availability

75、（ ）is enforced in 2021.

A、The Civil Code of the people's Republic of China

B、The Tendering and Bidding Law of the people's Republic of China

C、Government Procurement Law of the people's Republic of China

D、The Personal Inforation Protection Law of the People's Republic of China