如图3所示，电路在开关闭合后电路中的时间常数等于(     )。        

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420846 and id<>'4420846' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420846 and id<>'4420846' order by id asc limit 5