脑血流自身调节功能是指下列哪一指标在一定范围内波动，血流保持相对恒定

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27310' and id < 2261607 and id<>'2261607' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27310' and id > 2261607 and id<>'2261607' order by id asc limit 5