下列哪几项是神经纤维传导兴奋时的特征（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25947' and id < 2179991 and id<>'2179991' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25947' and id > 2179991 and id<>'2179991' order by id asc limit 5