核苷类药物水溶性大，其主要转运方式是（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24973' and id < 2127464 and id<>'2127464' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24973' and id > 2127464 and id<>'2127464' order by id asc limit 5