RC、RL电路的时间常数τ分别等于（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id < 2598927 and id<>'2598927' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id > 2598927 and id<>'2598927' order by id asc limit 5