如果某债券当前的市场价格为P，面值为F，年利息为C，其本期收益率r为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25444' and id < 2143264 and id<>'2143264' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25444' and id > 2143264 and id<>'2143264' order by id asc limit 5