大肠内的细菌可利用肠内物质合成下列哪种维生素

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29015' and id < 2361074 and id<>'2361074' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29015' and id > 2361074 and id<>'2361074' order by id asc limit 5