根据放电的特征，可用电场不均匀系数f表示电场的均匀程度，当（   ）时为稍不均匀电场。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68449' and id < 4418954 and id<>'4418954' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68449' and id > 4418954 and id<>'4418954' order by id asc limit 5