使用钻床钻孔时，工件是否需要牢固可靠地装夹？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30403' and id < 2457919 and id<>'2457919' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30403' and id > 2457919 and id<>'2457919' order by id asc limit 5