测定淬火钢件的硬度，一般常选用（ ）来测试。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24891' and id < 2124429 and id<>'2124429' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24891' and id > 2124429 and id<>'2124429' order by id asc limit 5