“凡事预则立，不预则废”这句话最恰当地体现了管理中（ ）的重要性。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31891' and id < 2549465 and id<>'2549465' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31891' and id > 2549465 and id<>'2549465' order by id asc limit 5