证券登记结算机构的职能不包括（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29901' and id < 2425222 and id<>'2425222' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29901' and id > 2425222 and id<>'2425222' order by id asc limit 5