我国现存的、最早的一部完整农书是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30388' and id < 2456593 and id<>'2456593' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30388' and id > 2456593 and id<>'2456593' order by id asc limit 5