肾维持体内水平衡的功能，主要靠调节下列哪项活 动来实现（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25944' and id < 2179837 and id<>'2179837' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25944' and id > 2179837 and id<>'2179837' order by id asc limit 5