只要知道下列哪一组物理量，就可以估算出气体中分子间的平均距离(    )   

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16965' and id < 1426343 and id<>'1426343' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16965' and id > 1426343 and id<>'1426343' order by id asc limit 5