2018 年 5 月卷 · 第 72 题

（72）is a decentralized, distributed and public digital ledger that is used torecord transactions across many computers so that the record cannot be alteredretroactively without the alteration of all subsequent blocks and the collusion of thenetwork.

• A.Cloud service
• B.Blockchain
• C.Internet of things
• D.Artificial intellingen