1/3单选题
难度：
1.下面4个图象都是幂函数的图象，函数
，其图象是（）
，其图象是（） | A |  |
| B |  |
| C |  |
| D |  |
正确答案：Qg==
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
时，幂函数
为减函数，则实数
（ ） 