图a所示电路的等效戴维宁电路如图b所示。则图b中的和的值分别为（   ）。图a     图b

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id < 4501216 and id<>'4501216' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id > 4501216 and id<>'4501216' order by id asc limit 5