AB |
CB |
CD |
A.-
| B.-
| C.-
| D.不存在 |
AB |
BD |
AB |
e1 |
e2 |
CB |
e1 |
e2 |
CD |
e1 |
e2 |
BD |
CD |
CB |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
e1 |
e2 |
|
9 |
4 |
a |
b |
e |
a |
b |
e |
a |
b |
e |
a |
b |
0 |
a |
b |
b |
0 |
a |
b |
0 |
a |
b |
A.①② | B.②④ | C.①③ | D.③④ |
a |
b |
a |
b |
b |
a |
A.
| B.-
| C.2 | D.-2 |
3 |
OC |
OA |
OB |
A.
| B.
| C.
| D.3 |
a |
b |
a |
b |
a |
b |
m |
n |
A.-
| B.2 | C.
| D.-2 |
a |
b |
AB |
BC |
CD |
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