下列哪些酸减对在生命体系中作为天然缓冲液？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30525' and id < 2464964 and id<>'2464964' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30525' and id > 2464964 and id<>'2464964' order by id asc limit 5