变压器油能吸收绕组和铁芯产生的热量，起到散热、冷却和（ ）作用。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id < 4421209 and id<>'4421209' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id > 4421209 and id<>'4421209' order by id asc limit 5