对称三相交流电任一瞬时值之和恒等于零，有效值之和恒等于零。（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32633' and id < 2594957 and id<>'2594957' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32633' and id > 2594957 and id<>'2594957' order by id asc limit 5