半夏在小陷胸汤中的作用是(  )。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25838' and id < 2170432 and id<>'2170432' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25838' and id > 2170432 and id<>'2170432' order by id asc limit 5