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[单选题]<p><span style="font-size:14px;font-family:宋体">设函数f(x)= </span><span style="font-size:14px;font-family:等线;position:relative;top:7px"><img width="25" height="26" src="/ueditor/themes/default/images/spacer.gif"/></span><span style="font-size:14px;font-family:'Calibri',sans-serif"> ,</span><span style="font-size:14px;font-family:宋体">则x=2是函数f(x)的( )。</span></p>