.潮流计算中的节点类型有哪几种?(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69495' and id < 4501852 and id<>'4501852' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69495' and id > 4501852 and id<>'4501852' order by id asc limit 5