价值工程中的功能是指产品的（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27079' and id < 2244594 and id<>'2244594' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27079' and id > 2244594 and id<>'2244594' order by id asc limit 5