变压器的空载运行是指变压器一次绕组加交流绕组，二次绕组（     ）的运行情况。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id < 4421126 and id<>'4421126' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68475' and id > 4421126 and id<>'4421126' order by id asc limit 5