电力系统潮流计算的方程属于(  )。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69416' and id < 4494620 and id<>'4494620' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69416' and id > 4494620 and id<>'4494620' order by id asc limit 5