在下列性质中，哪一个不是分时系统的特征？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30160' and id < 2440211 and id<>'2440211' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30160' and id > 2440211 and id<>'2440211' order by id asc limit 5