较早反映肾小球滤过功能减退的检查项目是(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3001' and id < 231820 and id<>'231820' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='3001' and id > 231820 and id<>'231820' order by id asc limit 5