价值工程的核心是对产品进行（ ）分析。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29338' and id < 2388787 and id<>'2388787' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29338' and id > 2388787 and id<>'2388787' order by id asc limit 5