按照国家标准，滚动轴承分为（ ）大类。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24900' and id < 2124778 and id<>'2124778' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24900' and id > 2124778 and id<>'2124778' order by id asc limit 5