神经冲动由突触前膜向突触后膜传递主要是依靠（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30915' and id < 2487836 and id<>'2487836' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30915' and id > 2487836 and id<>'2487836' order by id asc limit 5