已知电阻均为1Ω，当使用结点电压法分析时，结点1的自导为（   ）S。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500006 and id<>'4500006' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500006 and id<>'4500006' order by id asc limit 5