已知RC一阶电路的响应，则电路的时间常数（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id < 4420830 and id<>'4420830' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68466' and id > 4420830 and id<>'4420830' order by id asc limit 5