C提示:写成隐函数F(x,y,z)=0,即z-x2+y2=0

shuhaiku2019-12-17  17

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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/190/2457218_1.jpg[/img]
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