在肾小球滤液中几乎没有蛋白质，原因是（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25943' and id < 2179789 and id<>'2179789' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25943' and id > 2179789 and id<>'2179789' order by id asc limit 5