图中所示为一有源二端线性网络，它的戴维宁等效电压源的内阻R0为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id < 4501218 and id<>'4501218' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id > 4501218 and id<>'4501218' order by id asc limit 5