能够解释不同期限债券的利率往往会同升或同降现象的理论有（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25442' and id < 2143613 and id<>'2143613' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25442' and id > 2143613 and id<>'2143613' order by id asc limit 5