下列哪项是采购合同中避免潜在范围争议的最重要因素？

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27021' and id < 2240984 and id<>'2240984' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27021' and id > 2240984 and id<>'2240984' order by id asc limit 5