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A.2 B.4 C.16 D.不存在
A.[-2,-1] B.[-2,1] C.[-1,2] D.[1,2]
A.[-2,-1] B.[-2,1] C.[-1,2] D.[1,2]
A.[-2,-1]
B.[-2,1]
C.[-1,2]
D.[1,2]
A.圆 B.抛物线
C.椭圆 D.双曲线