在药品批号中，代表化学药品的字母是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30731' and id < 2475790 and id<>'2475790' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30731' and id > 2475790 and id<>'2475790' order by id asc limit 5