C提示 写成隐函数F(x,y,z)=0,即z-x2+y2=0

题库总管2019-12-17  2

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答案C

解析提示 写成隐函数F(x,y,z)=0,即z-x2+y2=0[img]/upload/tiku/233/2658612_1.jpg[/img]
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