.当变压器采用π形等值变压器模型时，改变变压器变比将引起系统节点导纳矩阵中所有元素的变化。(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69495' and id < 4501846 and id<>'4501846' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69495' and id > 4501846 and id<>'4501846' order by id asc limit 5