附子入汤剂宜先煎，其目的是(  )。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25761' and id < 2164990 and id<>'2164990' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25761' and id > 2164990 and id<>'2164990' order by id asc limit 5