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若函数的定义域为,值域为,则的取值范围是( ) A. B.[ ,4] C.[ ,...

若函数6ec8aac122bd4f6e的定义域为6ec8aac122bd4f6e,值域为6ec8aac122bd4f6e,则6ec8aac122bd4f6e的取值范围是(   )

A.6ec8aac122bd4f6e        B.[6ec8aac122bd4f6e ,4]    C.[6ec8aac122bd4f6e ,3]       D.[6ec8aac122bd4f6e ,+∞]

 

C 【解析】略
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