区块链本质上是一个去中心化的（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69405' and id < 4493599 and id<>'4493599' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69405' and id > 4493599 and id<>'4493599' order by id asc limit 5