a |
b |
a |
b |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
b |
a |
b |
a |
b |
A.①② | B.①③ | C.①③④ | D.②③④ |
a |
0 |
b |
a |
AO |
AB |
AC |
AB |
CB |
CD |
AC |
2 |
5 |
AB |
AC |
BC |
A.
| B.
| C.-
| D.-
|
OA |
a |
OB |
b |
OC |
c |
c |
a |
b |
A.线段AB上 | B.直线AB上 |
C.直线AB上,但除去A点 | D.直线AB上,但除去B点 |
e1 |
e2 |
a |
e1 |
e2 |
b |
e1 |
e2 |
a |
b |
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