沪深300指数的基点为（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30015' and id < 2431410 and id<>'2431410' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30015' and id > 2431410 and id<>'2431410' order by id asc limit 5