风险中性定价法假设所有证券的预期收益率都等于（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27089' and id < 2246478 and id<>'2246478' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27089' and id > 2246478 and id<>'2246478' order by id asc limit 5