数字化变电站自动化系统的结构在物理上可分为（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69524' and id < 4504319 and id<>'4504319' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69524' and id > 4504319 and id<>'4504319' order by id asc limit 5