a |
b |
3 |
a |
b |
b |
A.-2
| B.2
| C.4
| D.6
|
a |
b |
3 |
a |
b |
3 |
3 |
a |
b |
b |
3 |
3 |
3 |
3 |
3 |
3 |
a |
b |
c |
a |
b |
c |
a |
b |
a |
b |
a |
A.2 | B.1 | C.0 | D.-1 |
OA |
OB |
OC |
π |
3 |
OA |
BC |
AB |
OB |
a |
b |
a |
b |
a |
b |
a |
b |
A.相等 | B.相交但不垂直 |
C.平行 | D.垂直 |
. |
a |
. |
b |
. |
b |
. |
a |
. |
b |
. |
a |
. |
b |
. |
a |
. |
b |
. |
a |
. |
b |
. |
a |
. |
a |
. |
b |
b |
. |
a |
. |
b |
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