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    SQL语句错误： SELECT a.* FROM wkcx_content AS a,wkcx_class AS b WHERE a.cat_id=b.id and a.xianshi='1' AND a.cat_id in(1845,1846,1847) ORDER BY news_order ASC,add_time DESC limit -10,10
    错误信息： You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '-10,10' at line 1