以下介质中声速最慢的是

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31793' and id < 2541701 and id<>'2541701' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31793' and id > 2541701 and id<>'2541701' order by id asc limit 5