变压器中绝缘油的作用是（  ） 

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id < 4500652 and id<>'4500652' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id > 4500652 and id<>'4500652' order by id asc limit 5