图示电路中，欲使电流i中含有尽可能大的基波分量，Z应是（)元件。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32635' and id < 2595036 and id<>'2595036' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32635' and id > 2595036 and id<>'2595036' order by id asc limit 5