A.Y-X2(n) B.Y-X2(n-1) C. Y-F(n,1) D.Y-F(1,n)A.Y-X2(n) B.Y-X2(n-1) C. Y-F(n,1)

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问题

选项 A.Y-X2(n)
B.Y-X2(n-1)
C. Y-F(n,1)
D.Y-F(1,n)

答案C

解析
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