45钢中的45表示钢中平均含碳量为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id < 2124320 and id<>'2124320' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24889' and id > 2124320 and id<>'2124320' order by id asc limit 5