补体活化的经典途径开始于（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30912' and id < 2487597 and id<>'2487597' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30912' and id > 2487597 and id<>'2487597' order by id asc limit 5