在体内代谢过程中具有节约蛋白质作用的营养素是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30436' and id < 2459228 and id<>'2459228' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30436' and id > 2459228 and id<>'2459228' order by id asc limit 5