电力系统潮流计算中，必须设置，并且只设置一个平衡节点。(   )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496868 and id<>'4496868' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496868 and id<>'4496868' order by id asc limit 5