图示电路中，电阻R₁,应为下列哪项数值?(      )   

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496810 and id<>'4496810' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496810 and id<>'4496810' order by id asc limit 5