电力变压器按冷却介质分为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69521' and id < 4504057 and id<>'4504057' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69521' and id > 4504057 and id<>'4504057' order by id asc limit 5