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71、()is the core component of bitcoin。
A、Block chain
B、Hash
C、RSA
D、DES
参考答案：A
72、()is the action to eliminate the caues or ruduce the likehood of recurrence of a detected Nonconformity or other undersirabee situatlon.
A、corrective action
B、continual improvement
C、known error
D、preventive action
参考答案：A
73、()put forward the theory of statistical process control(SPC),which used statistical technology to monitor the production process to reduce the dependence on inspection.
A、Juran
B、shewhart
C、feigenbaum
D、taylor
参考答案：B
74、() is a way to organize experts to reach consensus. It helps to reduce data bias and prevent any individual from having an inappropriate impact on the results.
A、Brainstorm
B、Nominal technical team
C、Mind map
D、Delphi technology
参考答案：D
75、()is not primarily used to protect the correctness and integrity of data。
A、CA certification
B、Identity authentication service
C、Digital signature
D、Intrusion detection system
参考答案：B
