控制药物纯度的含义是（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27484' and id < 2270908 and id<>'2270908' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27484' and id > 2270908 and id<>'2270908' order by id asc limit 5