a≥2是函数f（x）=x2-2ax+3在区间[1，2]上单调的（  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19891' and id < 1727259 and id<>'1727259' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19891' and id > 1727259 and id<>'1727259' order by id asc limit 5