下图所示电路中，r=2,电路的等效阻抗为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32632' and id < 2594821 and id<>'2594821' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32632' and id > 2594821 and id<>'2594821' order by id asc limit 5