在机床正常运转加工工件时，不准做以下哪些操作？（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30404' and id < 2457961 and id<>'2457961' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30404' and id > 2457961 and id<>'2457961' order by id asc limit 5