油浸式变压器是指将铁心和绕组完全放置在（   ）中。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69399' and id < 4492784 and id<>'4492784' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69399' and id > 4492784 and id<>'4492784' order by id asc limit 5