图示电路在开关S闭合后的时间常数为，断开后的时间常数为，则和的关系是。() （0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69424' and id < 4495439 and id<>'4495439' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69424' and id > 4495439 and id<>'4495439' order by id asc limit 5