图示电路，t<0时已稳定，t=0时，开关S由1扳至2，则=（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id < 2598963 and id<>'2598963' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id > 2598963 and id<>'2598963' order by id asc limit 5