线性一端口，可以用（   ）求等效电阻。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id < 4501249 and id<>'4501249' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69473' and id > 4501249 and id<>'4501249' order by id asc limit 5