供应直肠、肛管的动脉中，最重要的（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25456' and id < 2144612 and id<>'2144612' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25456' and id > 2144612 and id<>'2144612' order by id asc limit 5