腰椎穿刺的目的是（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28791' and id < 2351843 and id<>'2351843' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28791' and id > 2351843 and id<>'2351843' order by id asc limit 5