与经典的突触传递相比，非定向突触传递的特 点是（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25947' and id < 2180000 and id<>'2180000' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25947' and id > 2180000 and id<>'2180000' order by id asc limit 5