电子的平均自由行程长度与(    )成正相关关系。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69526' and id < 4504614 and id<>'4504614' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69526' and id > 4504614 and id<>'4504614' order by id asc limit 5