图示电路开关打开已经很久，t=0时开关闭合，t≥0时的电容电压为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id < 2598940 and id<>'2598940' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32672' and id > 2598940 and id<>'2598940' order by id asc limit 5