.戴维宁定理所描述的等效电路仅（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id < 4502670 and id<>'4502670' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id > 4502670 and id<>'4502670' order by id asc limit 5