2. 计算机
  3. ( )is a decentralized，distributed and public digital ledger that is used to record transactions across many computers SO

( )is a decentralized，distributed and public digital ledger that is used to record transactions across many computers SO

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问题 (        )is a decentralized，distributed and public digital ledger that is used to record transactions across many computers SO that the record cannot be altered retroactively without the alteration of all subsequent blocks and the collusion of the network．
选项 A、Cloud service
B、Block chain
C、Internet of things
D、Artificial intelligence
答案B
解析 翻译：区块链是一种分散式、分布式和公共的数字分类账，能够横跨很多计算机记录交易，使得交易记录无法在不改变后续区块以及网络串通的情况下进行追溯。
    A．云服务    B．区块链    C．物联网    D．人工智能
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