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A.当a2+b2=r2时,圆必过原点 |
B.当a=r时,圆与y轴相切 |
C.当b=r时,圆与x轴相切 |
D.当b<r时,圆与x轴相交 |
A.x2+y2-4x-3=0 | B.x2+y2-4x+3=0 |
C.x2+y2+4x-5=0 | D.x2+y2+4x+5=0 |
A.只有(1)与(2)正确 | B.只有(1)与(3)正确 |
C.只有(2)与(3)正确 | D.(1)、(2)与(3)都正确 |
x2 |
a2 |
y2 |
b2 |
A.
| B.
| C.a | D.b |
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