价值工程应用中，对产品进行分析的核心是（

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29339' and id < 2388857 and id<>'2388857' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29339' and id > 2388857 and id<>'2388857' order by id asc limit 5