a |
b |
c |
a |
b |
a |
c |
b |
c |
a |
b |
c |
A.
| B.1 | C.
| D.2 |
a |
c |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
c |
a |
b |
a |
b |
c |
AB |
AC |
BC |
A.(0,-4)或(-2,0) | B.(0,4)或(2,0) | C.(0,-4) | D.(-2,0) |
m |
n |
m |
n |
CA |
AB |
AC |
a |
b |
a |
b |
a |
b |
3 |
CD |
OB |
OA |
OB |
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