各段肾小管中，重吸收占首位的是（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25943' and id < 2179810 and id<>'2179810' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25943' and id > 2179810 and id<>'2179810' order by id asc limit 5