下列哪一项不是唾液的生理作用（      ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25940' and id < 2179645 and id<>'2179645' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25940' and id > 2179645 and id<>'2179645' order by id asc limit 5