等面积定则主要用于分析简单系统的(    )  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69462' and id < 4498647 and id<>'4498647' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69462' and id > 4498647 and id<>'4498647' order by id asc limit 5