下列物质可以自由通过细胞膜的是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22009' and id < 1924303 and id<>'1924303' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='22009' and id > 1924303 and id<>'1924303' order by id asc limit 5