最大呼气流:fi(PEF)变异率为哪项时，可诊断哮喘 (    )

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26321' and id < 2201342 and id<>'2201342' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26321' and id > 2201342 and id<>'2201342' order by id asc limit 5