操作系统中P、V操作是一种 。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30160' and id < 2440275 and id<>'2440275' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30160' and id > 2440275 and id<>'2440275' order by id asc limit 5