铸铁中的碳以石墨形态析出的过程称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24888' and id < 2124237 and id<>'2124237' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24888' and id > 2124237 and id<>'2124237' order by id asc limit 5