正常人心率超过180次/min时，心输出量 减少的原因是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31862' and id < 2547230 and id<>'2547230' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31862' and id > 2547230 and id<>'2547230' order by id asc limit 5