.叠加定理只适用于（  ）电路。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id < 4497944 and id<>'4497944' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69454' and id > 4497944 and id<>'4497944' order by id asc limit 5