变压器储油柜的主要作用是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id < 4502964 and id<>'4502964' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id > 4502964 and id<>'4502964' order by id asc limit 5