题目内容：
自然失业率( )。
A. 恒为零
B. 依赖于价格水平
C. 经济处于潜在产出水平时的失业率
D. 是没有摩擦性失业时的失业率
参考答案：
选择题：自然失业率( )。
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- 题目类型：选择题
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