软件生命周期是指 （ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29842' and id < 2421916 and id<>'2421916' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29842' and id > 2421916 and id<>'2421916' order by id asc limit 5