.电力系统节点导纳矩阵中，某行(或某列)非对角元素之和的绝对值一定小于主对角元素的绝对值。(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69495' and id < 4501842 and id<>'4501842' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69495' and id > 4501842 and id<>'4501842' order by id asc limit 5