下列哪些在基因工程中经常用来运载目的基因  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20915' and id < 1822359 and id<>'1822359' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='20915' and id > 1822359 and id<>'1822359' order by id asc limit 5