体现中药饮片纯净度的指标是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30717' and id < 2474959 and id<>'2474959' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30717' and id > 2474959 and id<>'2474959' order by id asc limit 5