下列跨膜转运的方式中，不半f饱和现象的是（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25931' and id < 2179242 and id<>'2179242' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25931' and id > 2179242 and id<>'2179242' order by id asc limit 5