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设是曲线C:为参数,)上任意一点,则的取值范围是 ( ) A. B. C. D...

 设6ec8aac122bd4f6e是曲线C:6ec8aac122bd4f6e为参数,6ec8aac122bd4f6e)上任意一点,则6ec8aac122bd4f6e的取值范围是                                                               (     )

A.6ec8aac122bd4f6e                    B.6ec8aac122bd4f6e

C.6ec8aac122bd4f6e                    D.6ec8aac122bd4f6e

 

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