系统可维护性的评价指标不包括（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30194' and id < 2441975 and id<>'2441975' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30194' and id > 2441975 and id<>'2441975' order by id asc limit 5