曲面z=y+lnx/z在点(1,1,1)处的法线方程是:()
A . (x-1)/1=(y-1)/1=(z-1)/-1
B . (x-1)/1=(y-1)/1=(z-1)/-2
C . (x-1)/1=(y-1)/-1=(z-1)/-2
D . x+y-z=1
时间:2022-09-24 15:34:54
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