车床上装卸刀具和车削工件时均要先锁紧（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30403' and id < 2457924 and id<>'2457924' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30403' and id > 2457924 and id<>'2457924' order by id asc limit 5