下列哪一项在突触前末梢释放递质中的作用最 关键（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25933' and id < 2179323 and id<>'2179323' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25933' and id > 2179323 and id<>'2179323' order by id asc limit 5