税种可采用比例税率、累进税率或定额税率。下列我国现行税种中，采用定额税率的是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31905' and id < 2550782 and id<>'2550782' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31905' and id > 2550782 and id<>'2550782' order by id asc limit 5