变压器空载运行时，可以等效为一个（ ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id < 4421379 and id<>'4421379' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68478' and id > 4421379 and id<>'4421379' order by id asc limit 5