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第71題 （）is the core component of bitcoin.

A、Block chain

B、Hash

C、RSA

D、DES

第72題 （）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

第73題 （）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

74、（持續(xù)更新中）

第75題 （）is not primarily used to protect thee correctness and integrity of data.

A、CA certification

B、Identity authentication service

C、Digital signature

D、Intrusion detection system