出现黑便时，消化道出血量至少应超过(    )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26328' and id < 2201014 and id<>'2201014' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26328' and id > 2201014 and id<>'2201014' order by id asc limit 5