单项选择题
A.x2+y2=5x B.y2+z2=5x C.x2+z2=5x D.
A.2y2+z2=16 B.3y2+z2=16 C.2y2-z2=16 D.3y2-z2=16
A.2/3 B.1 C.2 D.3
A.x+y+z+2=0 B.x+y-z+2=0 C.x-y+z+2=0 D.x+y+z-2=0
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