电路如图所示，开关S在时打开，开关动作前电路已处于稳态。时的为（ ）V。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id < 4495229 and id<>'4495229' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id > 4495229 and id<>'4495229' order by id asc limit 5