.左图的等效戴维宁电路如右图所示，已知右图中的R0=5Ω，则左图中R2的值为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id < 4502649 and id<>'4502649' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69505' and id > 4502649 and id<>'4502649' order by id asc limit 5