已知函数 ，则函数f（x）在其定义域内的零点个数是（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='17609' and id < 1613254 and id<>'1613254' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='17609' and id > 1613254 and id<>'1613254' order by id asc limit 5