A.0<r<2 | B.0<r< |
C.0<r<2 | D.0<r<10 |
A.10 | B.10或-68 | C.5或-34 | D.-68 |
A.(x-1)2+(y-1)2="1" | B.(x-1)2+(y-1)2=1或(x-5)2+(y-5)2=5 |
C.(x-1)2+(y-1)2=1或(x-5)2+(y-5)2="25" | D.(x-5)2+(y-5)2=5 |
A.充分非必要条件 | B.必要非充分条件 |
C.充要条件 | D.既非充分又非必要条件 |
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