一般生物碱沉淀反应必须在是什么条件的溶液中生成

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30242' and id < 2446468 and id<>'2446468' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30242' and id > 2446468 and id<>'2446468' order by id asc limit 5