对于函数,若存在区间,使得,则称函数为“可等域函数”,区间为

对于函数,若存在区间,使得,则称函数可等域函数,区间为函数的一个可等域区间”.给出下列4个函数:.

其中存在唯一可等域区间可等域函数为(   

 ①②③            ②③            ①③            ②③④

答案

B

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