企业价值链由主体活动和辅助活动构成，下列不属于辅助活动的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28608' and id < 2335678 and id<>'2335678' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28608' and id > 2335678 and id<>'2335678' order by id asc limit 5