各种操作技能形成不可缺少的关键环节是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31723' and id < 2538861 and id<>'2538861' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31723' and id > 2538861 and id<>'2538861' order by id asc limit 5