突触传递不准许逆向传递的特性为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25676' and id < 2158596 and id<>'2158596' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25676' and id > 2158596 and id<>'2158596' order by id asc limit 5