e1 |
e2 |
π |
3 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
A.1 | B.-4 | C.-
| D.
|
a |
e1 |
e2 |
b |
e1 |
e2 |
e1 |
e2 |
π |
3 |
a |
b |
e1 |
e2 |
e1 |
e2 |
1 |
2 |
7 |
2 |
OA |
OB |
m |
n |
π |
2 |
π |
2 |
m |
n |
π |
3 |
π |
2 |
a |
b |
c |
a |
b |
a |
c |
b |
c |
a |
b |
c |
A.
| B.1 | C.
| D.2 |
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 |
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